Hello - We are experiencing extreme I/O slowness on a gfs2 volume on a SAN. We have a: Netezza TF24 IBM V7000 SAN IBM Bladecenter with 3 HS22 blades Stand alone HP DL380 G7 server The 3 blades and the HP DL380 are clustered using RHEL 6.1 and clustersuite 5.5. We have 2 clustered volumes on different storage pools (one has 10k drives the other 7.2k). We have an internal test that reads a large file (950G) using fopen and memmap. On a standalone server in a datacenter (Ubuntu Raid 5 10k disks) the tests take approximately 75seconds to run. On the blades the test takes 300 - 350 seconds. I have been looking at the cluster conf; any gfs tuning I can find. I am not really sure what I should post here? yrs Michael -- Michael Bubb System Administrator .................................................. T: +1.646.380-2738 | C: +1.646.783.8769 mbubb@xxxxxxxxxxxxxx | michael.bubb@xxxxxxxxx .................................................. Collective | collective.com | Twitter: @collectivesays 99 Park Ave. 5th Floor | New York, NY 10016 | +1.888.460.9513 ..................................................
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