@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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https://bugs.launchpad.net/bugs/1424114
Title:
lvm snapshot is not being autoextended
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