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From "Tom Bean" <>
Subject Cloudstack Xen Host High Availability and Fencing
Date Wed, 09 Jan 2013 08:49:43 GMT
Hi All,


I have stumbled across an issue/feature with Cloudstack (3.0.2) yesterday
which was a little worrying.


I was working on a primary storage which was added through Cloudstack but
had no VM's stored on it, so I did not think this would cause any issues.


While I was working on this storage device, it became unavailable for around
5 minutes, when it became unavailable all my Xen servers fenced, rebooted
and all my VM's shut down and one Xen server has now become corrupted.


I have tested this again on a second pool I have in cloudstack and when the
primary storage becomes unavailable all the Hosts reboot.


What I want to know is:


1.    Is there any way to disable this?

2.    It seems that in a pool where I have 5 storage repositories, if any of
them become unavailable, all of the hosts shut down. Is there a way to
specify the heart beat files be stored on a specific primary SR?



Tom Bean


Infrastructure & Support Analyst


The Changing Workplace








+44 (0)1444 44 1000 ext 316

+44 (0)1444 44 0944


Contact me via  <skype:thomas.bean.cwp?chat> Skype 

1 Boltro Road, Haywards Heath, RH16 1BY, United Kingdom


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