Public bug reported:
This is a weird corner case. Extending an lvmraid(7) type1 mirror for
the second time seems to result in the mirror legs not getting synced,
*if* there is another type1 mirror in the vg. This reliably reproduces
for me:
# quickly fill two 10G files with random data
openssl enc -aes-256-ctr -pass pass:"$(dd if=/dev/urandom bs=128 count=1
2>/dev/null | base64)" -nosalt < /dev/zero | dd bs=$((1024*1024*1024)) count=10
of=pv1.img iflag=fullblock
openssl enc -aes-256-ctr -pass pass:"$(dd if=/dev/urandom bs=128 count=1
2>/dev/null | base64)" -nosalt < /dev/zero | dd bs=$((1024*1024*1024)) count=10
of=pv2.img iflag=fullblock
# change loop devices if you have loads of snaps in use
losetup /dev/loop10 pv1.img
losetup /dev/loop11 pv2.img
pvcreate /dev/loop10
pvcreate /dev/loop11
vgcreate testvg /dev/loop10 /dev/loop11
lvcreate --type raid1 -L2G -n test testvg
watch lvs -o +raid_sync_action,sync_percent,raid_mismatch_count testvg
# wait for sync
lvcreate --type raid1 -L2G -n test2 testvg
watch lvs -o +raid_sync_action,sync_percent,raid_mismatch_count testvg
# wait for sync
# this will sync OK, observe kernel message for output from md subsys noting
time taken
#
lvextend -L+2G testvg/test2
watch lvs -o +raid_sync_action,sync_percent,raid_mismatch_count testvg
# wait for sync
# this will FAIL to sync, the sync will seem to complete instantly, e.g:
# Feb 02 15:22:50 asr-host kernel: md: resync of RAID array mdX
# Feb 02 15:22:50 asr-host kernel: md: mdX: resync done.
#
lvextend -L+2G testvg/test2
lvchange --syncaction check testvg/test2
watch lvs -o +raid_sync_action,sync_percent,raid_mismatch_count testvg
# observe error count
This may cause administrator alarm unnecessarily ... :/
For some reason the precise sizes with which the LVs are created, and
are then extended by, do appear to matter.
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: lvm2 2.02.176-4.1ubuntu3
ProcVersionSignature: Ubuntu 4.15.0-43.46-generic 4.15.18
Uname: Linux 4.15.0-43-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
Date: Sat Feb 2 15:33:16 2019
ProcEnviron:
TERM=screen
PATH=(custom, no user)
LANG=en_GB.UTF-8
SHELL=/bin/bash
SourcePackage: lvm2
UpgradeStatus: No upgrade log present (probably fresh install)
mtime.conffile..etc.lvm.lvm.conf: 2018-07-22T18:30:15.470358
** Affects: lvm2 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug bionic
** Summary changed:
- Second extent of second lvmraid mirror does not sync
+ Second extend of second lvmraid mirror does not sync
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1814389
Title:
Second extend of second lvmraid mirror does not sync
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/lvm2/+bug/1814389/+subscriptions
--
ubuntu-bugs mailing list
[email protected]
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
