Rei,
We did some testing with a TMS SSD array (over SRP) about a year ago. We did not see a substantial performance difference versus a write cache-on DDN system (I think it was a 9550 attached via IB SRP). With write cache turned off we did see a difference (I forget how large). Most of the tests were done with mdtest from LLNL. Sarp Oral did the evaluation. He can provide more details if you are interested. We are hoping to repeat these tests soon with some loaner hardware. We can share results as we get them, although our intent is to draft a white paper when we are done. --Shane -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Andreas Dilger Sent: Thursday, January 17, 2008 2:31 AM To: Rei Lee Cc: [email protected] Subject: Re: [Lustre-discuss] MDS/MDT Performance On Jan 15, 2008 11:08 -0800, Rei Lee wrote: > We are in the process of building a file system and > we are wondering whether we should get disk drivers > of 10K RPM or 15 RPM for the MDT? How is > the MDS performance affected by the performance > of the underlying disk drivers used by MDT? > Will solid-state disks provide a much better MDS > performance? The MDT is mostly IOPS and CPU bound, so faster disks will definitely make a difference, as will having a lot of RAM for filesystem metadata cache. Cheers, Andreas -- Andreas Dilger Sr. Staff Engineer, Lustre Group Sun Microsystems of Canada, Inc. _______________________________________________ Lustre-discuss mailing list [email protected] https://mail.clusterfs.com/mailman/listinfo/lustre-discuss _______________________________________________ Lustre-discuss mailing list [email protected] https://mail.clusterfs.com/mailman/listinfo/lustre-discuss
