On 2012-10-15 08:01, Jonathan Bayer wrote:
Hi,
I'm having a problem with a new VM which we just put into production.
We have 4 physical web servers, all running the same webapp. They
are all running RHEL 5.6
T
This new VM is configured the same way, the only real difference is
that it is CentOS instead of RHEL.
The apache configs are identical except for IP addresses.
The kernel parameters are also as identical as I can tell, by using
sysconfig -a and comparing the outputs between the two.
All physical servers have 8 cpus, and 48 gig of memory
The VM has 8 CPUs, and 30 gig of memory
The application goes to a load balancer, which then balances among
the systems using a least-connection protocol.
All servers have a 1 minute load of around 5, and an average of
around 200-300 reqs/second
The problem is that when the req/sec starts to climb on the VM, all
of a sudden the load average skyrockets to 40-50 or even higher. This
kills the server and makes it totally unresponsive.
Anybody have any suggestions?
Thanks in advance
JBB
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Check the VMs IOWait (via top or iotop) -- there's a lot of variables
here but IOWait can tend to be an issue with VMs that share physical
disks.
Tim
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