XenServer freezes when exporting a virtual machine

Question

linux

In XenServer 6.0, daily backups are configured using a script that turns off virtual machines one by one, exports them to an xe vm-exportNFS-mounted ball, and turns them back on.

Occasionally (once every few weeks or more) a problem arises - the server stops responding, you cannot connect to it either via SSH or via XenCenter. If you go to it locally, then it also hangs. I can’t say more precisely, because. the last time I was not there, and the server had to be urgently raised.

After restarting the server everything works fine.

According to the logs of my script for backups, I see that he stumbled on one virtual machine. In </var/logs/SMlog>, the last entry for this day is +2s from the beginning of the export of this virtual machine, then entries for the next day.

Tell me what logs to look at? Maybe someone faced a similar problem.

Answer 1

It would not be bad to install something like monit on the server where dom0 is and monitor LA. this virtualka is reserved at the moment of some kind of dom0-system activity. Or the activity of another virtual machine. And the export process, stupidly lacks resources.
Show ls -al /var/log/xen/ please.

Answer 2

The error is somewhere in the dom0 core - it can be seen from hunged tasks.