[PVE-User] RBD move disk : what about "sparse" blocks ?

Dmitry Petuhov mityapetuhov at gmail.com
Thu May 9 21:33:11 CEST 2019


It seems that guest kernel remembers which blocks it discarded recently 
and not tries to discard them again.

This behavior observed not only on LVM storage.


09.05.2019 18:54, Florent B пишет:
> On 07/05/2019 08:26, Alexandre DERUMIER wrote:
>>>> Of course when I run "fstrim -va" on the guest, I can't reclaim space
>>>> because kernel thinks it was already trimmed (while on source pool).
>> It should works without any problem. I have done it a thousand time.
>> fstrim do trim again and again a each run,for the whole disk.
>> (vs /etc/fstab discard option, which is doing it live only)
>
> I don't know why my Debian/Ubuntu VMs can't trim all disk space after
> moving rbd disk. I need to reboot VM to do it (simple reboot is enough)
>
> I always use LVM, is it related ?
>
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