Dne 16.10.2015 v 19:54 Ian Pilcher napsal(a):
On 09/11/2015 07:51 AM, Joe Thornber wrote:
No, this is not expected. The most likely cause is your system was
not shutdown cleanly so dm-cache has no choice but to assume all
blocks are dirty and need writing back. Make sure your volumes are
being deactivated as part of shutdown.
What exactly is required to cleanly shutdown an LVM cache or dm-cache
device?
AFAICT, systemd does a DM_DEV_REMOVE ioctl on all device mapper devices
during shutdown/reboot. Is this sufficient?
ONLY if the give device are UNUSED.
If the volume is e.g. mounted - then 'remove' is irrelevant.
You can't remove device with open count != 0.
(check with: dmsetup info -c)
Zdenek
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