Essex stable running on Xenserver: DEVICE_DETACH_REJECTED errors during stress test

asked 2012-04-10 17:34:25 -0500

gcivitella
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Hi all,

I'm seeing multiple DEVICE_DETACH_REJECTED errors in my nova-compute's logs when running a deploy's stress test. I run a few nova-compute vms (ubuntu 10.04 on kernel 3.2.7) on some xenserver6 nodes. The openstack's version I was running is Essex stable. While I was able to deploy correctly a single vm on every node, if I did try to schedule about five virtual machine's deploy per node, I received errors like those reported here:

http://paste.openstack.org/show/12634/

I did rollback to essex4 running on same xenserver hosts and on same nova-compute virtual machine. the errors vanished.

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answered 2012-04-17 13:36:14 -0500

gcivitella
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Sorry,

the problem was documented and Xen spcific. It was something similar to the problem described here: http://www.crucial.com.au/blog/2011/05/04/xenserver-internal-error-another-frontend-device-is-already-connect-to-this-domain/ (http://www.crucial.com.au/blog/2011/0...)

Giuseppe

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answered 2012-04-23 15:07:25 -0500

johngarbutt

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Hi,

It would be good to get you past these problems.

What exact version of XenServer were you trying with Essex stable? XenServer 6.0.2 (+ hotfix) has been released in the last few weeks.

Thanks, John

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answered 2012-04-24 10:03:16 -0500

gcivitella
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Hi,

I'm running Xenserver6, I did install all the patches available.

thanks

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answered 2012-04-24 10:20:37 -0500

gcivitella
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I mean XenServer 6.0 (build 50762p) with the following updates: XS60E001 XS60E002 XS60E003 XS60E004

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answered 2012-04-24 13:25:48 -0500

johngarbutt

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My suggestion would be to try 6.0.2

It might be worth raising the issue on the XenServer forum: http://forums.citrix.com/category.jspa?categoryID=101 (http://forums.citrix.com/category.jsp...)

However, as you Essex 4 seems to work, it might be a race condition within OpenStack. Are you OK adding a bug for this issue?

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answered 2012-04-24 13:43:45 -0500

gcivitella
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Sorry John,

I did not explain the right way why I transformed a bug to the present question. I found out that my problem was something happening at the Xenserver level during a stress test. It was something already documented by the xen community. It was not related on Openstack, neither Essex4 or Essex stable. To get through the problem i just implemented a quick and dirty nagios plugin to check for lost vbd.

thanks a lot for your time. Giuseppe