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Many modern devices use physical allocation units that are much
larger than the minimum logical allocation size accessible by
external commands. Two prevalent examples of this are 512e disk
drives (512b logical sector, 4K physical sector) and flash devices
(512b logical sector, 4K or larger allocation block size, and 128k
or larger erase block size). Operations that modify less than the
physical sector size result in a costly read-modify-write or garbage
collection sequence on these devices.
Simply exporting the true physical sector of the device to ZFS would
yield optimal performance, but has two serious drawbacks:
1. Existing pools created with devices that have different logical
and physical block sizes, but were configured to use the logical
block size (e.g. because the OS version used for pool construction
reported the logical block size instead of the physical block
size) will suddenly find that the vdev allocation size has
increased. This can be easily tolerated for active members of
the array, but ZFS would prevent replacement of a vdev with
another identical device because it now appears that the smaller
allocation size required by the pool is not supported by the new
device.
2. The device's physical block size may be too large to be supported
by ZFS. The optimal allocation size for the vdev may be quite
large. For example, a RAID controller may export a vdev that
requires read-modify-write cycles unless accessed using 64k
aligned/sized requests. ZFS currently has an 8k minimum block
size limit.
Reporting both the logical and physical allocation sizes for vdevs
solves these problems. A device may be used so long as the logical
block size is compatible with the configuration. By comparing the
logical and physical block sizes, new configurations can be optimized
and administrators can be notified of any existing pools that are
sub-optimal.
Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Co-authored-by: Matthew Macy <mmacy@freebsd.org>
Signed-off-by: Matt Macy <mmacy@FreeBSD.org>
Closes #10619
107 lines
3.7 KiB
C
107 lines
3.7 KiB
C
/*
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* Copyright (c) 2020 iXsystems, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _SPL_MOD_H
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#define _SPL_MOD_H
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#include <sys/sysctl.h>
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#define ZFS_MODULE_DESCRIPTION(s)
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#define ZFS_MODULE_AUTHOR(s)
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#define ZFS_MODULE_LICENSE(s)
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#define ZFS_MODULE_VERSION(s)
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#define EXPORT_SYMBOL(x)
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#define module_param(a, b, c)
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#define MODULE_PARM_DESC(a, b)
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#define ZMOD_RW CTLFLAG_RWTUN
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#define ZMOD_RD CTLFLAG_RDTUN
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/* BEGIN CSTYLED */
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#define ZFS_MODULE_PARAM(scope_prefix, name_prefix, name, type, perm, desc) \
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SYSCTL_DECL(_vfs_ ## scope_prefix); \
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SYSCTL_##type(_vfs_ ## scope_prefix, OID_AUTO, name, perm, &name_prefix ## name, 0, desc)
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#define ZFS_MODULE_PARAM_ARGS SYSCTL_HANDLER_ARGS
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#define ZFS_MODULE_PARAM_CALL_IMPL(parent, name, perm, args, desc) \
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SYSCTL_DECL(parent); \
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SYSCTL_PROC(parent, OID_AUTO, name, perm | args, desc)
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#define ZFS_MODULE_PARAM_CALL(scope_prefix, name_prefix, name, func, _, perm, desc) \
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ZFS_MODULE_PARAM_CALL_IMPL(_vfs_ ## scope_prefix, name, perm, func ## _args(name_prefix ## name), desc)
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#define param_set_arc_long_args(var) \
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CTLTYPE_ULONG, &var, 0, param_set_arc_long, "LU"
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#define param_set_arc_int_args(var) \
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CTLTYPE_INT, &var, 0, param_set_arc_int, "I"
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#define param_set_deadman_failmode_args(var) \
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CTLTYPE_STRING, NULL, 0, param_set_deadman_failmode, "A"
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#define param_set_deadman_synctime_args(var) \
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CTLTYPE_ULONG, NULL, 0, param_set_deadman_synctime, "LU"
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#define param_set_deadman_ziotime_args(var) \
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CTLTYPE_ULONG, NULL, 0, param_set_deadman_ziotime, "LU"
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#define param_set_multihost_interval_args(var) \
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CTLTYPE_ULONG, &var, 0, param_set_multihost_interval, "LU"
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#define param_set_slop_shift_args(var) \
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CTLTYPE_INT, &var, 0, param_set_slop_shift, "I"
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#define param_set_min_auto_ashift_args(var) \
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CTLTYPE_U64, &var, 0, param_set_min_auto_ashift, "QU"
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#define param_set_max_auto_ashift_args(var) \
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CTLTYPE_U64, &var, 0, param_set_max_auto_ashift, "QU"
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#include <sys/kernel.h>
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#define module_init(fn) \
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static void \
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wrap_ ## fn(void *dummy __unused) \
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{ \
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fn(); \
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} \
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SYSINIT(zfs_ ## fn, SI_SUB_LAST, SI_ORDER_FIRST, wrap_ ## fn, NULL)
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#define module_exit(fn) \
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static void \
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wrap_ ## fn(void *dummy __unused) \
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{ \
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fn(); \
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} \
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SYSUNINIT(zfs_ ## fn, SI_SUB_LAST, SI_ORDER_FIRST, wrap_ ## fn, NULL)
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/* END CSTYLED */
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#endif /* SPL_MOD_H */
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