From 0dc622c777d80a59819db727b4e759812281a513 Mon Sep 17 00:00:00 2001 From: Alasdair Kergon Date: Mon, 14 May 2012 16:29:50 +0000 Subject: [PATCH 1/1] Refer to details of snapshot of raid problem. --- doc/example.conf.in | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/doc/example.conf.in b/doc/example.conf.in index 72ba35cec..ad8f2caa1 100644 --- a/doc/example.conf.in +++ b/doc/example.conf.in @@ -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. -- 2.43.5