On Mon, Mar 12, 2018 at 1:40 PM, Andrei Verovski <andreil1@starlett.lv> wrote:

Hi !

I have stubborn VM (Ubuntu 16.04 LTS) which randomly freezes about each 2 - 3 weeks at weekends (when load is close to zero).
No updates or kernel upgrades help.
Freeze is not detected by oVirt watchdog and VM is not automatically restarted.

Since it happens only on weekends, I suspect some weekly cron job may cause this.
Ubuntu 16.04 LTS is installed on qcow2 disk image (thin provision).
is it possible that fstrim (which discards / trims unused blocks) is a source of this problem ?

Are you using virtio-blk (which doesn't support it) or virtio-SCSI (which does)?

Also, does the storage support trimming? Not all do.

Thanks in advance
Andrei

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