1c8fb911e6
- Update for latest mdadm-4.1+ patches, this is required by jsc#SLE-10078 and jsc#SLE-9348. Mostly the purpose is for latest Intel IMSM raid support. The following patches also include previous patches with new re-ordered prefix numbers. - Makefile: install mdadm_env.sh to /usr/lib/mdadm (bsc#1111960) 0000-Makefile-install-mdadm_env.sh-to-usr-lib-mdadm.patch - Assemble: keep MD_DISK_FAILFAST and MD_DISK_WRITEMOSTLY flag (jsc#SLE-10078, jsc#SLE-9348) 0001-Assemble-keep-MD_DISK_FAILFAST-and-MD_DISK_WRITEMOST.patch - Document PART-POLICY lines (jsc#SLE-10078, jsc#SLE-9348) 0002-Document-PART-POLICY-lines.patc - policy: support devices with multiple paths. (jsc#SLE-10078, jsc#SLE-9348) 0003-policy-support-devices-with-multiple-paths.patch - mdcheck: add systemd unit files to run mdcheck. (bsc#1115407) 0004-mdcheck-add-systemd-unit-files-to-run-mdcheck.patch - Monitor: add system timer to run --oneshot periodically (bsc#1115407) 0005-Monitor-add-system-timer-to-run-oneshot-periodically.patch - imsm: update metadata correctly while raid10 double (jsc#SLE-10078, jsc#SLE-9348) 0006-imsm-update-metadata-correctly-while-raid10-double-d.patch - Assemble: mask FAILFAST and WRITEMOSTLY flags when finding (jsc#SLE-10078, jsc#SLE-9348) 0007-Assemble-mask-FAILFAST-and-WRITEMOSTLY-flags-when-fi.patch - Grow: avoid overflow in compute_backup_blocks() (jsc#SLE-10078, jsc#SLE-9348) 0008-Grow-avoid-overflow-in-compute_backup_blocks.patch - Grow: report correct new chunk size. (jsc#SLE-10078, jsc#SLE-9348) 0009-Grow-report-correct-new-chunk-size.patch OBS-URL: https://build.opensuse.org/request/show/781064 OBS-URL: https://build.opensuse.org/package/show/Base:System/mdadm?expand=0&rev=181
59 lines
2.1 KiB
Diff
59 lines
2.1 KiB
Diff
From 2551061c253b8fd45ee93d1aab3e91d2c7ac9c20 Mon Sep 17 00:00:00 2001
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From: Coly Li <colyli@suse.de>
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Date: Mon, 24 Feb 2020 12:34:09 +0100
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Subject: [PATCH] mdadm.8: add note information for raid0 growing operation
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Git-commit: 2551061c253b8fd45ee93d1aab3e91d2c7ac9c20
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Patch-mainline: mdadm-4.1+
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References: bsc#1129900
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When growing a raid0 device, if the new component disk size is not
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big enough, the grow operation may fail due to lack of backup space.
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The minimum backup space should be larger than:
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LCM(old, new) * chunk-size * 2
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where LCM() is the least common multiple of the old and new count of
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component disks, and "* 2" comes from the fact that mdadm refuses to
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use more than half of a spare device for backup space.
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There are users reporting such failure when they grew a raid0 array
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with small component disk. Neil Brown points out this is not a bug
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and how the failure comes. This patch adds note information into
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mdadm(8) man page in the Notes part of GROW MODE section to explain
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the minimum size requirement of new component disk size or external
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backup size.
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Reviewed-by: Petr Vorel <pvorel@suse.cz>
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Cc: NeilBrown <neilb@suse.de>
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Cc: Jes Sorensen <jsorensen@fb.com>
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Cc: Paul Menzel <pmenzel@molgen.mpg.de>
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Cc: Wols Lists <antlists@youngman.org.uk>
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Cc: Nix <nix@esperi.org.uk>
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Signed-off-by: Coly Li <colyli@suse.de>
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Signed-off-by: Jes Sorensen <jsorensen@fb.com>
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---
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mdadm.8.in | 6 ++++++
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1 file changed, 6 insertions(+)
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diff --git a/mdadm.8.in b/mdadm.8.in
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index 5d00faf..a3494a1 100644
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--- a/mdadm.8.in
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+++ b/mdadm.8.in
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@@ -2768,6 +2768,12 @@ option and it is transparent for assembly feature.
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.IP \(bu 4
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Roaming between Windows(R) and Linux systems for IMSM metadata is not
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supported during grow process.
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+.IP \(bu 4
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+When growing a raid0 device, the new component disk size (or external
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+backup size) should be larger than LCM(old, new) * chunk-size * 2,
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+where LCM() is the least common multiple of the old and new count of
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+component disks, and "* 2" comes from the fact that mdadm refuses to
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+use more than half of a spare device for backup space.
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.SS SIZE CHANGES
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Normally when an array is built the "size" is taken from the smallest
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--
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2.25.0
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