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Refer to details of snapshot of raid problem.

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This commit is contained in:
Alasdair Kergon 2012-05-14 16:29:50 +00:00
parent e0ed1b458d
commit 0dc622c777
1 changed files with 6 additions and 2 deletions
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doc/example.conf.in
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@ -430,8 +430,12 @@ global {
# "mirror" - The original RAID1 implementation provided by LVM2/DM. It is
# characterized by a flexible log solution (core, disk, mirrored)
# and by the necessity to block I/O while reconfiguring in the
# event of a failure. Snapshots of this type of RAID1 can be
# problematic.
# event of a failure.
#
# There is an inherent race in the dmeventd failure handling
# logic with snapshots of devices using this type of RAID1 that
# in the worst case could cause a deadlock.
# Ref: https://bugzilla.redhat.com/show_bug.cgi?id=817130#c10
#
# "raid1" - This implementation leverages MD's RAID1 personality through
# device-mapper. It is characterized by a lack of log options.