Re: [ovirt-users] IO errors when adding new disk on iSCSI storage
adding federico since I think he can probably add more info here.
when we use thin provisionining we have to extend the disk during
writing (it's set to do that every 2GB I think).
during extend the vm pauses and resumes.
However, this action should not be noticeable by the vm user.
Does the vm pause and resumes or pauses completely? is it noticeable by
the vm user?
Thanks,
Dafna
On 05/16/2014 01:40 PM, John Taylor wrote:
Hi Morten,
My understanding of thin disks on a block domain is that vdsm traps
ENOSPC on the thin lv and uses the mailbox to get the SPM to extend
it. See a presentation by Nir
http://www.ovirt.org/File:Storage-mailbox.odp
I thought I saw somewhere there were some changes/bugs around that for
allowing mixed data centers (both block and file domains). ...just
looked now and this bz looks relevant
https://bugzilla.redhat.com/show_bug.cgi?id=1083476
So maybe you could check the engine logs and spm logs for that flow
(sorry I can't tell you any specifics about what you should look for )
-John
On Fri, May 16, 2014 at 1:54 AM, Morten A. Middelthon <morten(a)flipp.net> wrote:
> Hi,
>
> I just re-ran the test with adding a preallocated disk, and the problem did
> _not_ appear. I tried a few times to write large files with dd, but the vm
> continued to run without problems
>
> with regards,
>
>
> --
> Morten A. Middelthon
> Email: morten(a)flipp.net
> Phone: +47 907 83 708
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--
Dafna Ron