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OpenZFS 9318 - vol_volsize_to_reservation does not account for raidz skip blocks
When a volume is created in a pool with raidz vdevs and
volblocksize != 128k, the volume can reference more space than is
reserved with the automatically calculated refreservation. There
are two deficiencies in vol_volsize_to_reservation that contribute
to this:
1) Skip blocks may be added to keep each allocation a multiple
of parity + 1. This is the dominating factor when volblocksize
is close to 2^ashift.
2) raidz deflation for 128 KB blocks is different for most other
block sizes.
See "The theory of raidz space accounting" comment in
libzfs_dataset.c for a full explanation.
Authored by: Mike Gerdts <mike.gerdts@joyent.com>
Reviewed by: Richard Elling <Richard.Elling@RichardElling.com>
Reviewed by: Sanjay Nadkarni <sanjay.nadkarni@nexenta.com>
Reviewed by: Jerry Jelinek <jerry.jelinek@joyent.com>
Reviewed by: Matt Ahrens <matt@delphix.com>
Reviewed by: Kody Kantor <kody.kantor@joyent.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Approved by: Dan McDonald <danmcd@joyent.com>
Ported-by: Mike Gerdts <mike.gerdts@joyent.com>
Porting Notes:
* ZTS: wait for zvols to exist before writing
* ZTS: use log_must_busy with {zpool|zfs} destroy
OpenZFS-issue: https://www.illumos.org/issues/9318
OpenZFS-commit: https://github.com/illumos/illumos-gate/commit/b73ccab0
Closes #8973
This commit is contained in:
Mike Gerdts
Tony Hutter
parent
350646563f
commit
f3f46b0e45
@ -29,6 +29,7 @@
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* Copyright 2016 Nexenta Systems, Inc.
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* Copyright (c) 2019 Datto Inc.
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* Copyright (c) 2019, loli10K <ezomori.nozomu@gmail.com>
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* Copyright 2019 Joyent, Inc.
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*/
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#include <assert.h>
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@ -992,10 +993,11 @@ zfs_do_create(int argc, char **argv)
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zpool_close(zpool_handle);
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goto error;
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}
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zpool_close(zpool_handle);
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volsize = zvol_volsize_to_reservation(volsize, real_props);
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volsize = zvol_volsize_to_reservation(zpool_handle, volsize,
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real_props);
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nvlist_free(real_props);
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zpool_close(zpool_handle);
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if (nvlist_lookup_string(props, zfs_prop_to_name(resv_prop),
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&strval) != 0) {
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@ -22,7 +22,7 @@
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/*
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* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2011, 2018 by Delphix. All rights reserved.
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* Copyright (c) 2012, Joyent, Inc. All rights reserved.
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* Copyright Joyent, Inc.
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* Copyright (c) 2013 Steven Hartland. All rights reserved.
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* Copyright (c) 2016, Intel Corporation.
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* Copyright 2016 Nexenta Systems, Inc.
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@ -687,7 +687,8 @@ extern int zfs_hold(zfs_handle_t *, const char *, const char *,
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extern int zfs_hold_nvl(zfs_handle_t *, int, nvlist_t *);
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extern int zfs_release(zfs_handle_t *, const char *, const char *, boolean_t);
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extern int zfs_get_holds(zfs_handle_t *, nvlist_t **);
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extern uint64_t zvol_volsize_to_reservation(uint64_t, nvlist_t *);
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extern uint64_t zvol_volsize_to_reservation(zpool_handle_t *, uint64_t,
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nvlist_t *);
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typedef int (*zfs_userspace_cb_t)(void *arg, const char *domain,
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uid_t rid, uint64_t space);
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@ -21,7 +21,7 @@
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/*
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* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2018, Joyent, Inc. All rights reserved.
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* Copyright 2019 Joyent, Inc.
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* Copyright (c) 2011, 2017 by Delphix. All rights reserved.
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* Copyright (c) 2012 DEY Storage Systems, Inc. All rights reserved.
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* Copyright (c) 2012 Pawel Jakub Dawidek <pawel@dawidek.net>.
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@ -1618,6 +1618,7 @@ zfs_add_synthetic_resv(zfs_handle_t *zhp, nvlist_t *nvl)
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uint64_t new_reservation;
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zfs_prop_t resv_prop;
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nvlist_t *props;
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zpool_handle_t *zph = zpool_handle(zhp);
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/*
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* If this is an existing volume, and someone is setting the volsize,
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@ -1632,7 +1633,7 @@ zfs_add_synthetic_resv(zfs_handle_t *zhp, nvlist_t *nvl)
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fnvlist_add_uint64(props, zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE),
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zfs_prop_get_int(zhp, ZFS_PROP_VOLBLOCKSIZE));
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if ((zvol_volsize_to_reservation(old_volsize, props) !=
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if ((zvol_volsize_to_reservation(zph, old_volsize, props) !=
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old_reservation) || nvlist_exists(nvl,
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zfs_prop_to_name(resv_prop))) {
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fnvlist_free(props);
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@ -1643,7 +1644,7 @@ zfs_add_synthetic_resv(zfs_handle_t *zhp, nvlist_t *nvl)
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fnvlist_free(props);
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return (-1);
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}
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new_reservation = zvol_volsize_to_reservation(new_volsize, props);
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new_reservation = zvol_volsize_to_reservation(zph, new_volsize, props);
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fnvlist_free(props);
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if (nvlist_add_uint64(nvl, zfs_prop_to_name(resv_prop),
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@ -1698,7 +1699,8 @@ zfs_fix_auto_resv(zfs_handle_t *zhp, nvlist_t *nvl)
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volsize = zfs_prop_get_int(zhp, ZFS_PROP_VOLSIZE);
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}
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resvsize = zvol_volsize_to_reservation(volsize, props);
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resvsize = zvol_volsize_to_reservation(zpool_handle(zhp), volsize,
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props);
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fnvlist_free(props);
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(void) nvlist_remove_all(nvl, zfs_prop_to_name(prop));
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@ -5363,12 +5365,176 @@ zfs_get_holds(zfs_handle_t *zhp, nvlist_t **nvl)
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}
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/*
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* Convert the zvol's volume size to an appropriate reservation.
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* The theory of raidz space accounting
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*
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* The "referenced" property of RAIDZ vdevs is scaled such that a 128KB block
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* will "reference" 128KB, even though it allocates more than that, to store the
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* parity information (and perhaps skip sectors). This concept of the
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* "referenced" (and other DMU space accounting) being lower than the allocated
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* space by a constant factor is called "raidz deflation."
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*
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* As mentioned above, the constant factor for raidz deflation assumes a 128KB
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* block size. However, zvols typically have a much smaller block size (default
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* 8KB). These smaller blocks may require proportionally much more parity
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* information (and perhaps skip sectors). In this case, the change to the
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* "referenced" property may be much more than the logical block size.
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*
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* Suppose a raidz vdev has 5 disks with ashift=12. A 128k block may be written
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* as follows.
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*
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* +-------+-------+-------+-------+-------+
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* | disk1 | disk2 | disk3 | disk4 | disk5 |
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* +-------+-------+-------+-------+-------+
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* | P0 | D0 | D8 | D16 | D24 |
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* | P1 | D1 | D9 | D17 | D25 |
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* | P2 | D2 | D10 | D18 | D26 |
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* | P3 | D3 | D11 | D19 | D27 |
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* | P4 | D4 | D12 | D20 | D28 |
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* | P5 | D5 | D13 | D21 | D29 |
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* | P6 | D6 | D14 | D22 | D30 |
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* | P7 | D7 | D15 | D23 | D31 |
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* +-------+-------+-------+-------+-------+
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*
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* Above, notice that 160k was allocated: 8 x 4k parity sectors + 32 x 4k data
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* sectors. The dataset's referenced will increase by 128k and the pool's
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* allocated and free properties will be adjusted by 160k.
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*
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* A 4k block written to the same raidz vdev will require two 4k sectors. The
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* blank cells represent unallocated space.
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*
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* +-------+-------+-------+-------+-------+
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* | disk1 | disk2 | disk3 | disk4 | disk5 |
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* +-------+-------+-------+-------+-------+
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* | P0 | D0 | | | |
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* +-------+-------+-------+-------+-------+
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*
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* Above, notice that the 4k block required one sector for parity and another
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* for data. vdev_raidz_asize() will return 8k and as such the pool's allocated
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* and free properties will be adjusted by 8k. The dataset will not be charged
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* 8k. Rather, it will be charged a value that is scaled according to the
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* overhead of the 128k block on the same vdev. This 8k allocation will be
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* charged 8k * 128k / 160k. 128k is from SPA_OLD_MAXBLOCKSIZE and 160k is as
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* calculated in the 128k block example above.
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*
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* Every raidz allocation is sized to be a multiple of nparity+1 sectors. That
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* is, every raidz1 allocation will be a multiple of 2 sectors, raidz2
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* allocations are a multiple of 3 sectors, and raidz3 allocations are a
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* multiple of of 4 sectors. When a block does not fill the required number of
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* sectors, skip blocks (sectors) are used.
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*
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* An 8k block being written to a raidz vdev may be written as follows:
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*
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* +-------+-------+-------+-------+-------+
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* | disk1 | disk2 | disk3 | disk4 | disk5 |
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* +-------+-------+-------+-------+-------+
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* | P0 | D0 | D1 | S0 | |
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* +-------+-------+-------+-------+-------+
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*
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* In order to maintain the nparity+1 allocation size, a skip block (S0) was
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* added. For this 8k block, the pool's allocated and free properties are
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* adjusted by 16k and the dataset's referenced is increased by 16k * 128k /
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* 160k. Again, 128k is from SPA_OLD_MAXBLOCKSIZE and 160k is as calculated in
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* the 128k block example above.
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*
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* Compression may lead to a variety of block sizes being written for the same
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* volume or file. There is no clear way to reserve just the amount of space
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* that will be required, so the worst case (no compression) is assumed.
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* Note that metadata blocks will typically be compressed, so the reservation
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* size returned by zvol_volsize_to_reservation() will generally be slightly
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* larger than the maximum that the volume can reference.
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*/
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/*
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* Derived from function of same name in module/zfs/vdev_raidz.c. Returns the
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* amount of space (in bytes) that will be allocated for the specified block
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* size. Note that the "referenced" space accounted will be less than this, but
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* not necessarily equal to "blksize", due to RAIDZ deflation.
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*/
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static uint64_t
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vdev_raidz_asize(uint64_t ndisks, uint64_t nparity, uint64_t ashift,
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uint64_t blksize)
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{
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uint64_t asize, ndata;
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ASSERT3U(ndisks, >, nparity);
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ndata = ndisks - nparity;
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asize = ((blksize - 1) >> ashift) + 1;
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asize += nparity * ((asize + ndata - 1) / ndata);
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asize = roundup(asize, nparity + 1) << ashift;
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return (asize);
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}
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/*
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* Determine how much space will be allocated if it lands on the most space-
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* inefficient top-level vdev. Returns the size in bytes required to store one
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* copy of the volume data. See theory comment above.
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*/
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static uint64_t
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volsize_from_vdevs(zpool_handle_t *zhp, uint64_t nblocks, uint64_t blksize)
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{
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nvlist_t *config, *tree, **vdevs;
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uint_t nvdevs, v;
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uint64_t ret = 0;
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config = zpool_get_config(zhp, NULL);
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if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, &tree) != 0 ||
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nvlist_lookup_nvlist_array(tree, ZPOOL_CONFIG_CHILDREN,
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&vdevs, &nvdevs) != 0) {
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return (nblocks * blksize);
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}
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for (v = 0; v < nvdevs; v++) {
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char *type;
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uint64_t nparity, ashift, asize, tsize;
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nvlist_t **disks;
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uint_t ndisks;
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uint64_t volsize;
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if (nvlist_lookup_string(vdevs[v], ZPOOL_CONFIG_TYPE,
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&type) != 0 || strcmp(type, VDEV_TYPE_RAIDZ) != 0 ||
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nvlist_lookup_uint64(vdevs[v], ZPOOL_CONFIG_NPARITY,
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&nparity) != 0 ||
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nvlist_lookup_uint64(vdevs[v], ZPOOL_CONFIG_ASHIFT,
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&ashift) != 0 ||
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nvlist_lookup_nvlist_array(vdevs[v], ZPOOL_CONFIG_CHILDREN,
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&disks, &ndisks) != 0) {
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continue;
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}
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/* allocation size for the "typical" 128k block */
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tsize = vdev_raidz_asize(ndisks, nparity, ashift,
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SPA_OLD_MAXBLOCKSIZE);
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/* allocation size for the blksize block */
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asize = vdev_raidz_asize(ndisks, nparity, ashift, blksize);
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/*
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* Scale this size down as a ratio of 128k / tsize. See theory
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* statement above.
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*/
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volsize = nblocks * asize * SPA_OLD_MAXBLOCKSIZE / tsize;
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if (volsize > ret) {
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ret = volsize;
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}
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}
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if (ret == 0) {
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ret = nblocks * blksize;
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}
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return (ret);
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}
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/*
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* Convert the zvol's volume size to an appropriate reservation. See theory
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* comment above.
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*
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* Note: If this routine is updated, it is necessary to update the ZFS test
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* suite's shell version in reservation.kshlib.
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* suite's shell version in reservation.shlib.
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*/
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uint64_t
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zvol_volsize_to_reservation(uint64_t volsize, nvlist_t *props)
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zvol_volsize_to_reservation(zpool_handle_t *zph, uint64_t volsize,
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nvlist_t *props)
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{
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uint64_t numdb;
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uint64_t nblocks, volblocksize;
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@ -5384,7 +5550,14 @@ zvol_volsize_to_reservation(uint64_t volsize, nvlist_t *props)
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zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE),
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&volblocksize) != 0)
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volblocksize = ZVOL_DEFAULT_BLOCKSIZE;
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nblocks = volsize/volblocksize;
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nblocks = volsize / volblocksize;
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/*
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* Metadata defaults to using 128k blocks, not volblocksize blocks. For
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* this reason, only the data blocks are scaled based on vdev config.
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*/
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volsize = volsize_from_vdevs(zph, nblocks, volblocksize);
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/* start with metadnode L0-L6 */
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numdb = 7;
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/* calculate number of indirects */
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@ -755,7 +755,8 @@ tags = ['functional', 'refquota']
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[tests/functional/refreserv]
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tests = ['refreserv_001_pos', 'refreserv_002_pos', 'refreserv_003_pos',
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'refreserv_004_pos', 'refreserv_005_pos']
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'refreserv_004_pos', 'refreserv_005_pos', 'refreserv_multi_raidz',
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'refreserv_raidz']
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tags = ['functional', 'refreserv']
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[tests/functional/removal]
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@ -6,7 +6,9 @@ dist_pkgdata_SCRIPTS = \
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refreserv_002_pos.ksh \
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refreserv_003_pos.ksh \
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refreserv_004_pos.ksh \
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refreserv_005_pos.ksh
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refreserv_005_pos.ksh \
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refreserv_multi_raidz.ksh \
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refreserv_raidz.ksh
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dist_pkgdata_DATA = \
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refreserv.cfg
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197
tests/zfs-tests/tests/functional/refreserv/refreserv_multi_raidz.ksh
Executable file
197
tests/zfs-tests/tests/functional/refreserv/refreserv_multi_raidz.ksh
Executable file
@ -0,0 +1,197 @@
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#!/bin/ksh -p
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#
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# This file and its contents are supplied under the terms of the
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# Common Development and Distribution License ("CDDL"), version 1.0.
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# You may only use this file in accordance with the terms of version
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# 1.0 of the CDDL.
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#
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# A full copy of the text of the CDDL should have accompanied this
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# source. A copy of the CDDL is also available via the Internet at
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# http://www.illumos.org/license/CDDL.
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#
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#
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# Copyright 2019 Joyent, Inc.
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#
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. $STF_SUITE/include/libtest.shlib
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. $STF_SUITE/tests/functional/refreserv/refreserv.cfg
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#
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# DESCRIPTION:
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# raidz refreservation=auto picks worst raidz vdev
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#
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# STRATEGY:
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# 1. Create a pool with a single raidz vdev
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# 2. For each block size [512b, 1k, 128k] or [4k, 8k, 128k]
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# - create a volume
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# - remember its refreservation
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# - destroy the volume
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# 3. Destroy the pool
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# 4. Recreate the pool with one more disk in the vdev, then repeat steps
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# 2 and 3.
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#
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# NOTES:
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# 1. This test will use up to 14 disks but can cover the key concepts with
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# 5 disks.
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# 2. If the disks are a mixture of 4Kn and 512n/512e, failures are likely.
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#
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verify_runnable "global"
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typeset -a alldisks=($DISKS)
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# The larger the volsize, the better zvol_volsize_to_reservation() is at
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# guessing the right number - though it is horrible with tiny blocks. At 10M on
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# ashift=12, the estimate may be over 26% too high.
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volsize=100
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function cleanup
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{
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default_cleanup_noexit
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default_setup_noexit "${alldisks[0]}"
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}
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log_assert "raidz refreservation=auto picks worst raidz vdev"
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log_onexit cleanup
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poolexists "$TESTPOOL" && log_must_busy zpool destroy "$TESTPOOL"
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# Testing tiny block sizes on ashift=12 pools causes so much size inflation
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# that small test disks may fill before creating small volumes. However,
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# testing 512b and 1K blocks on ashift=9 pools is an ok approximation for
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# testing the problems that arise from 4K and 8K blocks on ashift=12 pools.
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bps=$(lsblk -nrdo min-io /dev/${alldisks[0]})
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case "$bps" in
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512)
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||||
allshifts=(9 10 17)
|
||||
;;
|
||||
4096)
|
||||
allshifts=(12 13 17)
|
||||
;;
|
||||
*)
|
||||
log_fail "bytes/sector: $bps != (512|4096)"
|
||||
;;
|
||||
esac
|
||||
log_note "Testing in ashift=${allshifts[0]} mode"
|
||||
|
||||
typeset -A sizes=
|
||||
|
||||
#
|
||||
# Determine the refreservation for a $volsize MiB volume on each raidz type at
|
||||
# various block sizes.
|
||||
#
|
||||
for parity in 1 2 3; do
|
||||
raid=raidz$parity
|
||||
typeset -A sizes["$raid"]
|
||||
|
||||
# Ensure we hit scenarios with and without skip blocks
|
||||
for ndisks in $((parity * 2)) $((parity * 2 + 1)); do
|
||||
typeset -a disks=(${alldisks[0..$((ndisks - 1))]})
|
||||
|
||||
if (( ${#disks[@]} < ndisks )); then
|
||||
log_note "Too few disks to test $raid-$ndisks"
|
||||
continue
|
||||
fi
|
||||
|
||||
typeset -A sizes["$raid"]["$ndisks"]
|
||||
|
||||
log_must zpool create "$TESTPOOL" "$raid" "${disks[@]}"
|
||||
|
||||
for bits in "${allshifts[@]}"; do
|
||||
vbs=$((1 << bits))
|
||||
log_note "Gathering refreservation for $raid-$ndisks" \
|
||||
"volblocksize=$vbs"
|
||||
|
||||
vol=$TESTPOOL/$TESTVOL
|
||||
log_must zfs create -V ${volsize}m \
|
||||
-o volblocksize=$vbs "$vol"
|
||||
|
||||
refres=$(zfs get -Hpo value refreservation "$vol")
|
||||
log_must test -n "$refres"
|
||||
sizes["$raid"]["$ndisks"]["$vbs"]=$refres
|
||||
|
||||
log_must_busy zfs destroy "$vol"
|
||||
done
|
||||
|
||||
log_must_busy zpool destroy "$TESTPOOL"
|
||||
done
|
||||
done
|
||||
|
||||
# A little extra info is always helpful when diagnosing problems. To
|
||||
# pretty-print what you find in the log, do this in ksh:
|
||||
# typeset -A sizes=(...)
|
||||
# print -v sizes
|
||||
log_note "sizes=$(print -C sizes)"
|
||||
|
||||
#
|
||||
# Helper furnction for checking that refreservation is calculated properly in
|
||||
# multi-vdev pools. "Properly" is defined as assuming that all vdevs are as
|
||||
# space inefficient as the worst one.
|
||||
#
|
||||
function check_vdevs {
|
||||
typeset raid=$1
|
||||
typeset nd1=$2
|
||||
typeset nd2=$3
|
||||
typeset -a disks1 disks2
|
||||
typeset vbs vol refres refres1 refres2 expect
|
||||
|
||||
disks1=(${alldisks[0..$((nd1 - 1))]})
|
||||
disks2=(${alldisks[$nd1..$((nd1 + nd2 - 1))]})
|
||||
if (( ${#disks2[@]} < nd2 )); then
|
||||
log_note "Too few disks to test $raid-$nd1 + $raid=$nd2"
|
||||
return
|
||||
fi
|
||||
|
||||
log_must zpool create -f "$TESTPOOL" \
|
||||
"$raid" "${disks1[@]}" "$raid" "${disks2[@]}"
|
||||
|
||||
for bits in "${allshifts[@]}"; do
|
||||
vbs=$((1 << bits))
|
||||
log_note "Verifying $raid-$nd1 $raid-$nd2 volblocksize=$vbs"
|
||||
|
||||
vol=$TESTPOOL/$TESTVOL
|
||||
log_must zfs create -V ${volsize}m -o volblocksize=$vbs "$vol"
|
||||
refres=$(zfs get -Hpo value refreservation "$vol")
|
||||
log_must test -n "$refres"
|
||||
|
||||
refres1=${sizes["$raid"]["$nd1"]["$vbs"]}
|
||||
refres2=${sizes["$raid"]["$nd2"]["$vbs"]}
|
||||
|
||||
if (( refres1 > refres2 )); then
|
||||
log_note "Expecting refres ($refres) to match refres" \
|
||||
"from $raid-$nd1 ($refres1)"
|
||||
log_must test "$refres" -eq "$refres1"
|
||||
else
|
||||
log_note "Expecting refres ($refres) to match refres" \
|
||||
"from $raid-$nd1 ($refres2)"
|
||||
log_must test "$refres" -eq "$refres2"
|
||||
fi
|
||||
|
||||
log_must zfs destroy "$vol"
|
||||
done
|
||||
|
||||
log_must zpool destroy "$TESTPOOL"
|
||||
}
|
||||
|
||||
#
|
||||
# Verify that multi-vdev pools use the last optimistic size for all the
|
||||
# permutations within a particular raidz variant.
|
||||
#
|
||||
for raid in "${!sizes[@]}"; do
|
||||
# ksh likes to create a [0] item for us. Thanks, ksh!
|
||||
[[ $raid == "0" ]] && continue
|
||||
|
||||
for nd1 in "${!sizes["$raid"][@]}"; do
|
||||
# And with an empty array we get one key, ''. Thanks, ksh!
|
||||
[[ $nd1 == "0" || -z "$nd1" ]] && continue
|
||||
|
||||
for nd2 in "${!sizes["$raid"][@]}"; do
|
||||
[[ $nd2 == "0" || -z "$nd2" ]] && continue
|
||||
|
||||
check_vdevs "$raid" "$nd1" "$nd2"
|
||||
done
|
||||
done
|
||||
done
|
||||
|
||||
log_pass "raidz refreservation=auto picks worst raidz vdev"
|
||||
130
tests/zfs-tests/tests/functional/refreserv/refreserv_raidz.ksh
Executable file
130
tests/zfs-tests/tests/functional/refreserv/refreserv_raidz.ksh
Executable file
@ -0,0 +1,130 @@
|
||||
#!/bin/ksh -p
|
||||
#
|
||||
# This file and its contents are supplied under the terms of the
|
||||
# Common Development and Distribution License ("CDDL"), version 1.0.
|
||||
# You may only use this file in accordance with the terms of version
|
||||
# 1.0 of the CDDL.
|
||||
#
|
||||
# A full copy of the text of the CDDL should have accompanied this
|
||||
# source. A copy of the CDDL is also available via the Internet at
|
||||
# http://www.illumos.org/license/CDDL.
|
||||
#
|
||||
|
||||
#
|
||||
# Copyright 2019 Joyent, Inc.
|
||||
#
|
||||
|
||||
. $STF_SUITE/include/libtest.shlib
|
||||
. $STF_SUITE/tests/functional/refreserv/refreserv.cfg
|
||||
|
||||
#
|
||||
# DESCRIPTION:
|
||||
# raidz refreservation=auto accounts for extra parity and skip blocks
|
||||
#
|
||||
# STRATEGY:
|
||||
# 1. Create a pool with a single raidz vdev
|
||||
# 2. For each block size [512b, 1k, 128k] or [4k, 8k, 128k]
|
||||
# - create a volume
|
||||
# - fully overwrite it
|
||||
# - verify that referenced is less than or equal to reservation
|
||||
# - destroy the volume
|
||||
# 3. Destroy the pool
|
||||
# 4. Recreate the pool with one more disk in the vdev, then repeat steps
|
||||
# 2 and 3.
|
||||
# 5. Repeat all steps above for raidz2 and raidz3.
|
||||
#
|
||||
# NOTES:
|
||||
# 1. This test will use up to 14 disks but can cover the key concepts with
|
||||
# 5 disks.
|
||||
# 2. If the disks are a mixture of 4Kn and 512n/512e, failures are likely.
|
||||
#
|
||||
|
||||
verify_runnable "global"
|
||||
|
||||
typeset -a alldisks=($DISKS)
|
||||
|
||||
# The larger the volsize, the better zvol_volsize_to_reservation() is at
|
||||
# guessing the right number. At 10M on ashift=12, the estimate may be over 26%
|
||||
# too high.
|
||||
volsize=100
|
||||
|
||||
function cleanup
|
||||
{
|
||||
default_cleanup_noexit
|
||||
default_setup_noexit "${alldisks[0]}"
|
||||
}
|
||||
|
||||
log_assert "raidz refreservation=auto accounts for extra parity and skip blocks"
|
||||
log_onexit cleanup
|
||||
|
||||
poolexists "$TESTPOOL" && log_must_busy zpool destroy "$TESTPOOL"
|
||||
|
||||
# Testing tiny block sizes on ashift=12 pools causes so much size inflation
|
||||
# that small test disks may fill before creating small volumes. However,
|
||||
# testing 512b and 1K blocks on ashift=9 pools is an ok approximation for
|
||||
# testing the problems that arise from 4K and 8K blocks on ashift=12 pools.
|
||||
bps=$(lsblk -nrdo min-io /dev/${alldisks[0]})
|
||||
log_must test "$bps" -eq 512 -o "$bps" -eq 4096
|
||||
case "$bps" in
|
||||
512)
|
||||
allshifts=(9 10 17)
|
||||
maxpct=151
|
||||
;;
|
||||
4096)
|
||||
allshifts=(12 13 17)
|
||||
maxpct=110
|
||||
;;
|
||||
*)
|
||||
log_fail "bytes/sector: $bps != (512|4096)"
|
||||
;;
|
||||
esac
|
||||
log_note "Testing in ashift=${allshifts[0]} mode"
|
||||
|
||||
# This loop handles all iterations of steps 1 through 4 described in strategy
|
||||
# comment above,
|
||||
for parity in 1 2 3; do
|
||||
raid=raidz$parity
|
||||
|
||||
# Ensure we hit scenarios with and without skip blocks
|
||||
for ndisks in $((parity * 2)) $((parity * 2 + 1)); do
|
||||
typeset -a disks=(${alldisks[0..$((ndisks - 1))]})
|
||||
|
||||
if (( ${#disks[@]} < ndisks )); then
|
||||
log_note "Too few disks to test $raid-$ndisks"
|
||||
continue
|
||||
fi
|
||||
|
||||
log_must zpool create "$TESTPOOL" "$raid" "${disks[@]}"
|
||||
|
||||
for bits in "${allshifts[@]}"; do
|
||||
vbs=$((1 << bits))
|
||||
log_note "Testing $raid-$ndisks volblocksize=$vbs"
|
||||
|
||||
vol=$TESTPOOL/$TESTVOL
|
||||
log_must zfs create -V ${volsize}m \
|
||||
-o volblocksize=$vbs "$vol"
|
||||
block_device_wait "/dev/zvol/$vol"
|
||||
log_must dd if=/dev/zero of=/dev/zvol/$vol \
|
||||
bs=1024k count=$volsize
|
||||
sync
|
||||
|
||||
ref=$(zfs get -Hpo value referenced "$vol")
|
||||
refres=$(zfs get -Hpo value refreservation "$vol")
|
||||
log_must test -n "$ref"
|
||||
log_must test -n "$refres"
|
||||
|
||||
typeset -F2 deltapct=$((refres * 100.0 / ref))
|
||||
log_note "$raid-$ndisks refreservation $refres" \
|
||||
"is $deltapct% of reservation $res"
|
||||
|
||||
log_must test "$ref" -le "$refres"
|
||||
log_must test "$deltapct" -le $maxpct
|
||||
|
||||
log_must_busy zfs destroy "$vol"
|
||||
done
|
||||
|
||||
log_must_busy zpool destroy "$TESTPOOL"
|
||||
done
|
||||
done
|
||||
|
||||
log_pass "raidz refreservation=auto accounts for extra parity and skip blocks"
|
||||
Loading…
Reference in New Issue
Block a user