On 03/12/2018 01:50 PM, Yaniv Kaul wrote:
>
>
> On Mon, Mar 12, 2018 at 1:40 PM, Andrei Verovski <andre...@starlett.lv
> <mailto:andre...@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.

I'm using virtio-SCSI, Ubuntu thin provision disk formatted as ext4 boot
+ ext4 root + swap.
Disk image on ext4 RAID 1.

> Y.
>  
>
>
>     Thanks in advance
>     Andrei
>
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>

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