On Fri, Mar 16, 2018 at 1:25 PM, Enrico Becchetti <enrico.becchetti@pg.infn.it> wrote:

Dear All,
Does someone had seen that error ? When I run this command from my virtual machine:

# time dd if=/dev/zero of=enrico.dd bs=4k count=10000000

I don't think it's a very interesting test case for IO performance, but in any case, it may cause the VM to try to write faster than its thin provisioned disk can be extended.

A simple workaround would be to change in VDSM the threshold of when it gets extended and by how much.

For example:

[irs]

volume_utilization_percent = 15

volume_utilization_chunk_mb = 4048

VM was paused due to kind a storage error/problem. Strange message
because tell about "no storage space error" but ovirt puts virtual machine in
a paused state.

Inside events from ovirt web interface I see this:

"VM has been paused due to lack of storage space"

but no ERROR found in /var/log/vdsm.log.

My oVirt enviroment 4.2.1 has three hypervivosr with FC storage and before now
I haven't see any other problem during the normal functioning of the vm , it's seem
that this error occurs only when there is massive I/O.

Any ideas ?
Thanks a lot.
Best Regards
Enrico

--
_______________________________________________________________________

Enrico Becchetti Servizio di Calcolo e Reti

Istituto Nazionale di Fisica Nucleare - Sezione di Perugia
Via Pascoli,c/o Dipartimento di Fisica 06123 Perugia (ITALY)
Phone:+39 075 5852777 Mail: Enrico.Becchetti<at>pg.infn.it
______________________________________________________________________

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