Something which bothered us at work for ... / 2010-11-30

2010-11-30 Something which bothered us at work for ...
Something which bothered us at work for some time now is the weird habit of our Xen servers to report:
Error: (12, 'Cannot allocate memory')
Where we think there is enough (18G free at the moment) to allocate for a 512 Mb virtual machine. I searched high and low for this before but never found a working answer. With some other changes in the Xen cluster planned I was looking for answers again to this problem and found: Xen, HVM, and running out of memory which shows that the size of dom0 may be causing this. Asking Xen for memory info gives totally different numbers:
# xm info
..
total_memory           : 24570
free_memory            : 4
I guess the dom0 has somehow allocated those 18G in a way which Xen can't get back. Now to see whether adjusting dom0_mem will fix this...
Update: It took longer than expected because other parts of Xen acted up again, but the Xen cluster is available again with better memory allocation giving us a lot more space for virtual machine services.
# xm info
..
total_memory           : 24570
free_memory            : 14668
That is on the machine running most virtual machine services.

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