[ovirt-users] VM has been paused due to NO STORAGE SPACE ERROR ?!?!?!?!

[Alex Crow]

On 16/03/18 13:46, Nicolas Ecarnot wrote:
> Le 16/03/2018 à 13:28, Karli Sjöberg a écrit :
>>
>>
>> Den 16 mars 2018 12:26 skrev Enrico Becchetti 
>> <enrico.becchetti at pg.infn.it>:
>>
>>        Dear All,
>>     Does someone had seen that error ?
>
> Yes, I experienced it dozens of times on 3.6 (my 4.2 setup has 
> insufficient workload to trigger such event).
> And in every case, there was no actual lack of space.
>
>>     Enrico Becchetti Servizio di Calcolo e Reti
>> I think I remember something to do with thin provisioning and not 
>> being able to grow fast enough, so out of space. Are the VM's disk 
>> thick or thin?
>
> All our storage domains are thin-prov. and served by iSCSI (Equallogic 
> PS6xxx and 4xxx).
>
> Enrico, do you know if a bug has been filed about this?
>
Did the VM remain paused? In my experience the VM just gets temporarily 
paused while the storage is expanded. RH confirmed to me in a ticket 
that this is expected behaviour.

If you need high write performance your VM disks should always be 
preallocated. We only use Thin Provision for VMs where we know that disk 
writes are low (eg network services, CPU-bound apps, etc).

Alex
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