Ovirt devel - Aug 2010 - iSCSI and disk timeouts

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.

Cheers,
Justin.

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.