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This patch adds a new top-level vdev type called dRAID, which stands
for Distributed parity RAID. This pool configuration allows all dRAID
vdevs to participate when rebuilding to a distributed hot spare device.
This can substantially reduce the total time required to restore full
parity to pool with a failed device.
A dRAID pool can be created using the new top-level `draid` type.
Like `raidz`, the desired redundancy is specified after the type:
`draid[1,2,3]`. No additional information is required to create the
pool and reasonable default values will be chosen based on the number
of child vdevs in the dRAID vdev.
zpool create <pool> draid[1,2,3] <vdevs...>
Unlike raidz, additional optional dRAID configuration values can be
provided as part of the draid type as colon separated values. This
allows administrators to fully specify a layout for either performance
or capacity reasons. The supported options include:
zpool create <pool> \
draid[<parity>][:<data>d][:<children>c][:<spares>s] \
<vdevs...>
- draid[parity] - Parity level (default 1)
- draid[:<data>d] - Data devices per group (default 8)
- draid[:<children>c] - Expected number of child vdevs
- draid[:<spares>s] - Distributed hot spares (default 0)
Abbreviated example `zpool status` output for a 68 disk dRAID pool
with two distributed spares using special allocation classes.
```
pool: tank
state: ONLINE
config:
NAME STATE READ WRITE CKSUM
slag7 ONLINE 0 0 0
draid2:8d:68c:2s-0 ONLINE 0 0 0
L0 ONLINE 0 0 0
L1 ONLINE 0 0 0
...
U25 ONLINE 0 0 0
U26 ONLINE 0 0 0
spare-53 ONLINE 0 0 0
U27 ONLINE 0 0 0
draid2-0-0 ONLINE 0 0 0
U28 ONLINE 0 0 0
U29 ONLINE 0 0 0
...
U42 ONLINE 0 0 0
U43 ONLINE 0 0 0
special
mirror-1 ONLINE 0 0 0
L5 ONLINE 0 0 0
U5 ONLINE 0 0 0
mirror-2 ONLINE 0 0 0
L6 ONLINE 0 0 0
U6 ONLINE 0 0 0
spares
draid2-0-0 INUSE currently in use
draid2-0-1 AVAIL
```
When adding test coverage for the new dRAID vdev type the following
options were added to the ztest command. These options are leverages
by zloop.sh to test a wide range of dRAID configurations.
-K draid|raidz|random - kind of RAID to test
-D <value> - dRAID data drives per group
-S <value> - dRAID distributed hot spares
-R <value> - RAID parity (raidz or dRAID)
The zpool_create, zpool_import, redundancy, replacement and fault
test groups have all been updated provide test coverage for the
dRAID feature.
Co-authored-by: Isaac Huang <he.huang@intel.com>
Co-authored-by: Mark Maybee <mmaybee@cray.com>
Co-authored-by: Don Brady <don.brady@delphix.com>
Co-authored-by: Matthew Ahrens <mahrens@delphix.com>
Co-authored-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Mark Maybee <mmaybee@cray.com>
Reviewed-by: Matt Ahrens <matt@delphix.com>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #10102
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107 lines
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Groff
'\" t
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.\"
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.\" CDDL HEADER START
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.\"
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.\" The contents of this file are subject to the terms of the
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.\" Common Development and Distribution License (the "License").
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.\" You may not use this file except in compliance with the License.
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.\"
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.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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.\" or http://www.opensolaris.org/os/licensing.
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.\" See the License for the specific language governing permissions
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.\" and limitations under the License.
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.\"
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.\" When distributing Covered Code, include this CDDL HEADER in each
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.\" file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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.\" If applicable, add the following below this CDDL HEADER, with the
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.\" fields enclosed by brackets "[]" replaced with your own identifying
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.\" information: Portions Copyright [yyyy] [name of copyright owner]
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.\"
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.\" CDDL HEADER END
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.\"
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.\"
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.\" Copyright (c) 2016 Gvozden Nešković. All rights reserved.
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.\"
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.TH RAIDZ_TEST 1 "Aug 24, 2020" OpenZFS
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.SH NAME
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\fBraidz_test\fR \- raidz implementation verification and benchmarking tool
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.SH SYNOPSIS
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.LP
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.BI "raidz_test <options>"
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.SH DESCRIPTION
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.LP
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This manual page documents briefly the \fBraidz_test\fR command.
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.LP
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Purpose of this tool is to run all supported raidz implementation and verify
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results of all methods. Tool also contains a parameter sweep option where all
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parameters affecting RAIDZ block are verified (like ashift size, data offset,
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data size, etc...).
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The tool also supports a benchmarking mode using -B option.
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.SH OPTION
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.HP
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.BI "\-h" ""
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.IP
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Print a help summary.
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.HP
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.BI "\-a" " ashift (default: 9)"
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.IP
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Ashift value.
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.HP
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.BI "\-o" " zio_off_shift" " (default: 0)"
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.IP
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Zio offset for raidz block. Offset value is 1 << (zio_off_shift)
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.HP
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.BI "\-d" " raidz_data_disks" " (default: 8)"
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.IP
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Number of raidz data disks to use. Additional disks for parity will be used
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during testing.
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.HP
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.BI "\-s" " zio_size_shift" " (default: 19)"
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.IP
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Size of data for raidz block. Size is 1 << (zio_size_shift).
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.HP
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.BI "\-r" " reflow_offset" " (default: uint max)"
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.IP
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Set raidz expansion offset. The expanded raidz map allocation function will
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produce different map configurations depending on this value.
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.HP
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.BI "\-S(weep)"
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.IP
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Sweep parameter space while verifying the raidz implementations. This option
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will exhaust all most of valid values for -a -o -d -s options. Runtime using
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this option will be long.
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.HP
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.BI "\-t(imeout)"
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.IP
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Wall time for sweep test in seconds. The actual runtime could be longer.
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.HP
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.BI "\-B(enchmark)"
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.IP
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This options starts the benchmark mode. All implementations are benchmarked
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using increasing per disk data size. Results are given as throughput per disk,
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measured in MiB/s.
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.HP
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.BI "\-e(xpansion)"
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.IP
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Use expanded raidz map allocation function.
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.HP
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.BI "\-v(erbose)"
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.IP
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Increase verbosity.
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.HP
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.BI "\-T(est the test)"
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.IP
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Debugging option. When this option is specified tool is supposed to fail
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all tests. This is to check if tests would properly verify bit-exactness.
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.HP
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.BI "\-D(ebug)"
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.IP
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Debugging option. Specify to attach gdb when SIGSEGV or SIGABRT are received.
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.HP
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.SH "SEE ALSO"
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.BR "ztest (1)"
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.SH "AUTHORS"
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vdev_raidz, created for OpenZFS by Gvozden Nešković <neskovic@gmail.com>
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