@Donk yes, of course.
% ps auxfw | grep '[d]'meventd
root 3325 0.1 0.0 574972 18956 ? S<Lsl Jan30 25:34 /sbin/dmeventd
% dpkg -l dmeventd | grep ^.i
ii dmeventd 2:1.02.77-6ubuntu2
amd64 Linux Kernel Device Mapper event daemon
% egrep '^[^#]*(snapshot_autoextend|monitoring)' /etc/lvm/lvm.conf
snapshot_autoextend_threshold = 80
snapshot_autoextend_percent = 20
monitoring = 1
And syslog actually mentions:
Feb 12 06:18:04 hostname lvm[3325]: Monitoring snapshot vgname-lvname
Yet, it never notices the increases, for example:
Feb 12 06:18:07 hostname kernel: [1102775.345351] device-mapper: snapshots:
Invalidating snapshot: Unable to allocate exception.
Feb 12 06:18:07 drop kernel: [1102775.345746] Buffer I/O error on device dm-0,
logical block 60118
...
% sudo dmsetup info --noheadings -c -o name /dev/dm-0
vgname-lvname
Now you could say this particular one happened three seconds later and
it never had the chance, but it actually just never happens, over months
of usage.
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Touch seeded packages, which is subscribed to lvm2 in Ubuntu.
https://bugs.launchpad.net/bugs/1424114
Title:
lvm snapshot is not being autoextended
Status in lvm2 package in Ubuntu:
Confirmed
Bug description:
After setting auto extend threshold and rebooting, lvm snapshots are
not being auto extended.
Steps to recreate:
1. Using Ubuntu 14.04 LTS
2. Set snapshot_autoextend_threshold to less than 100
# grep autoext /etc/lvm/lvm.conf
snapshot_autoextend_threshold = 50
snapshot_autoextend_percent = 20
3. Reboot server to have lvm reread lvm.conf
4. Create a snapshot of a mounted logical volume
# lvcreate -s /dev/testVG/testLV -L 1G -n testLVsnap
5. Make modifications to mounted logical volume
6. List logical volumes and snapshots
# lvs
LV VG Attr LSize Pool Origin Data% Move Log Copy%
Convert
testLV testVG owi-aos-- 10.00g
testLVsnap testVG swi-a-s-- 1.00g testLV 95.04
What I expected to have happened:
Once Data% of snapshot reached the snapshot_autoextend_threshold, the
snapshot logical volume should have been auto extended.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/lvm2/+bug/1424114/+subscriptions
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