On 09/08/2011 07:12 PM, Hans van Kranenburg wrote:
When putting disk/network load on one of our office servers, Xen/dom0 crashes. Triple ctrl-a does not react any more on serial console. We did not encounter this earlier on this particular piece of hardware, having tortured it some more in the past. A few days ago we set up drbd on this host [...]
I've been searching some more, using snippets from the stacktrace. This seems to be a known issue [1], [2] when using DRBD in combination with Xen.
A workaround should be to set the option disable_sendpage when loading the drbd module [3], [4].
I remember reading about this some months ago. I've set this option on both of the Xen/DRBD hosts at the office...
echo 1 > /sys/module/drbd/parameters/disable_sendpage... and added the "options drbd disable_sendpage=1" into /etc/modprobe.d/drbd.conf
Next week we'll see what happens when we put some stress on it. [1] http://www.gossamer-threads.com/lists/drbd/users/16962[2] http://www.mentby.com/Group/drbd-user/kernel-panic-in-skbcopybits-squeeze.html
[3] http://www.gossamer-threads.com/lists/drbd/users/19980 [4] http://www.drbd.org/users-guide/s-xen-drbd-mod-params.html -- Hans van Kranenburg - System / Network Engineer T +31 (0)10 2760434 | hans.van.kranenburg@mendix.com | www.mendix.com