[Ovirt-devel] iSCSI and disk timeouts

[Nicolas Ochem]

Hi Justin,
I can suggest a method to make sure the problem is iscsi related :

-log in to the node
-copy the image file to RAM (by putting it in /tmp) or to an external
storage if it's too big
-restart the VM directly in libvirt (virsh dumpxml, virsh destroy , virsh
create) after having modified the XML file to point to the local version iso
iSCSI

If the problem is gone then iscsi is the issue.
Hope this helps

On Tue, Aug 31, 2010 at 1:09 AM, Justin Clacherty <justin at redfish.com.au>wrote:

>  On 26/08/2010 6:00 PM, Justin Clacherty wrote:
>
>>  Hi,
>>
>> I'm having a problem where one of the VM's I'm running appears to be
>> hanging.  I think what might be happening is that the disk is timing out and
>> being mounted read-only (or something like that).  The VM image is on an
>> iSCSI volume.
>>
>> What timeouts are set for iSCSI on the node?  I seem to recall it being
>> either 30 seconds or 2 minutes but I haven't been able to confirm.  What
>> timeouts are set for the hard drive within the VM?
>>
>> I'm wondering if it's not actually iSCSI that's the problem, but the fact
>> that the VM actually thinks it's a local hard disk.  Perhaps the volume is
>> taking a bit longer than normal to respond at times and iSCSI deals with
>> this but because the VM thinks it's a local hard drive the timeouts are
>> shorter so it returns an error and remounts read-only.
>>
>> I've left the console to the VM logged in for now in the hopes of catching
>> an error message this time.
>>
>
> hmm, doesn't seem to print out anything on the console.  Anyone got info on
> the FS timeouts?
>
>
> Cheers,
> Justin.
>
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