[Xen-users] Xen on Debian Lenny quite unstable

["Dirk H. Schulz" <dirk.schulz@xxxxxxxxxxxxx>]

Hi folks,

I have several servers running the Xen packages from Debian Lenny - the 
cpu architectures are ranging from dual pentium III, dual xeons from 4 
years ago and current quad core xeons. All share a problem: they 
frequently crash.
The physical machine then reboots, and in the logs there is absolutely 
nothing. The intervals between crashes range from just a day to around 
30 days in the max, but mostly it happens roughly every few days. The 
only pattern I found so far is: the more virtual machines on the host, 
the infrequent the crashes (that alone is weird).
To avoid these crashes I tried
- setting dom0_min_mem to 1 GB in the Xen config and similar in the Xen 
kernel config in grubs menu.lst,
- binding each domU to a certain cpu or cpu core while dedicating one 
cpu or core to dom0,
- dedicate at least 512 MB of RAM to each domU (whether needed or not).

Nothing really helps and I am stuck. Googleing does not lead to anything 
helpful.
Is it a problem of Debians Xen implementation (I had the same issues 
with Ubuntu 8.04)? Is it a general problem of Xen 3.2 (Xen 3.03 on my 
RedHat/CentOS servers runs very, very, very stable and smooth)? Is there 
anything I can do or check?
Any hint or help is appreciated.

Dirk

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