Hi Dave,
Does restarting the servers help? Are the client nodes getting
rebooted ever?
-sam
On Jul 1, 2009, at 4:43 PM, David Bonnie wrote:
Hello all -
I'm having trouble figuring out a problem with performance
depredation on a simple 10 node cluster. Prior runs on the cluster
(before this problem manifested itself) resulted in bandwidth and
IOPS about 10 times higher on a small file creation workload. Each
node is running as a metadata server and a data server.
The problem is persistent between versions and installations of
PVFS2 2.8.0 and 2.8.1. Rebooting all of the nodes didn't improve
anything. The network connections (simple GigE) showed no errors or
dropped packets. Using different physical disks (both SAS and FC)
didn't improve things. The kernel logs didn't show anything out of
place nor did the pvfs2 server or client logs. It seems like a
network issue but I can't seem to find anything wrong with any of
the connections.
Has anyone seen this kind of problem before? I seem to remember
something on the list before about performance suddenly dropping but
I can't find the message now (of course). Any insight would be
appreciated!
Thanks,
- Dave
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