Loop devices exhausted on fedora-vm02

[Mike Burns]

On 03/18/2013 08:25 AM, Eyal Edri wrote:
>
>
> ----- Original Message -----
>> From: "Fabian Deutsch" <fabiand at redhat.com>
>> To: infra at ovirt.org
>> Sent: Monday, March 18, 2013 1:08:12 PM
>> Subject: Loop devices exhausted on fedora-vm02
>>
>> Hey,
>>
>> it seems that all loop devices on fedora-vm02
>> are taken:
>> http://jenkins.ovirt.org/view/ovirt_node/job/ovirt-node-iso/671/console
>>
>> Could someone look into this?
>
> can you explain why it happens? (ovirt-node jobs?)
> maybe the job should add a cleanup step at end to release unused loop devices?

Looking here [1] there are 2 iso build jobs that could be running on the 
host at the same time.

We could throttle the jobs so that they can't run concurrently.  We can 
also simply add something like max_loops=256 on the kernel commandline 
so that there are extra loop devices.

We've seen this happen before, and livecd-tools is pretty good about 
cleaning up, even in failure scenarios (as long as you don't ctrl-c or 
kill -9 the job).  But a single job uses a number of loop devices 
(3,4,5,6, not actually sure the number).  It also uses lazy umounts in 
some cases meaning that there could be a couple loop devices in use that 
get cleaned up at a later point.

The simplest fix for this would be to increase the default number of 
loop devices.

Mike

[1] http://jenkins.ovirt.org/computer/fedora18-vm02/

>
>>
>> Thanks
>> fabian
>>
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