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xen-users
Re: [Xen-users] Frequent para (Linux) domU hangs
Hi Jan,
You should strongly consider adding swap. Running a webserver is like
running on ice. I am building custom servers for quite a long time, but
I never ever considered that a web server has "sufficient" memory. Maybe
only if we are talking about some 200-400GB RAM host? Then you could
assign "sufficient" memory to each of your two web server and have some
for the other 3 VPSs running there.
Adding a 1GB swap file to each of your VPS will show that I'm right. ;)
I always am! :D
Good luck!
Jan Bakuwel wrote:
Hi,
I'm running Debian Lenny (2.6.26-1-xen-amd64) dom0 thats running 5
Debian Lenny 2.6.26-1-xen-amd64 domU's. The two busiest of those VMs
(webservers) frequently hang (every few days); the other three VMs have
not hung a single time in 122 days (and nor has dom0 obviously). The
syslogs (of the VMs and dom0) don't show anything useful; I haven't been
able to correlate the hangs with any event in particular; the hangs seem
to happen quite randomly (and not necessarily when the VMs are busy).
All domU's run without swap and sufficient memory (monitor statistics
show a fair bit of memory allocated to the cache at all times). All VMs
and dom0 share a single Internet connection and all run their own
specific firewall.
When a VM hangs, xentop actually thinks its running (its state = r and
its using nearly 100% CPU). Its not possible to connect to the VM via
the network (not even ping it), nor is it possible to connect the
console (console just hangs).
I appreciate any hints, suggestions, etc how I can further diagnose this
problem.
thanks,
Jan
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Deac Mihai-Adrian
W: www.mikesoftware.com
P: +40-745-256.364
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