[Lustre-discuss] OSS1 write performance impacted by OSS3 writes?!
Dan
dan at nerp.net
Thu Oct 28 14:41:52 PDT 2010
Hi,
I have 4 OSSs with 4 OSTs each still running 1.6.7.2 on RHEL 4. I stripped files across OSTs specific to each OSS to test network bandwidth. Then wrote to each file from separate clients. The network is currently single GigE link to each OSS/client via Cisco 4503. Bonding 4 links to each OSS after resolving this current issue I hope.
Here's the problem. When I start writing to OSS3 it cuts the performance of OSS1 in half and only achieves half of it's network bandwidth. Stop writing to OSS1 and 3 gets full bandwidth or vice versa. If I write to OSS1,2 and 4 or OSS2,3,4 all get full bandwidth. I've checked what OSTs the files were stripped against and looked at the network config. Further more collectl shows no cross traffic (if I had messed up file stripes). No ideas...
What could cause this?
Thanks,
Dan
-- Sent from my Palm Pre
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