[linux-lvm] LVM cache (or dm-cache) shutdown

[Ian Pilcher]

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?

Thanks!

-- 
========================================================================
Ian Pilcher                                         arequipeno at gmail.com
-------- "I grew up before Mark Zuckerberg invented friendship" --------
========================================================================