[CentOS] Performance problem with CentOS and XFS on EMC

Mark Hull-Richter
Thu, 08 Mar 2007 21:50:13 -0000

We have an appliance that uses the CentOS 4.4 Plus kernel with XFS on an EMC
RAID array that performs about ? or less as well with cached i/o than with
direct i/o.  With direct i/o we get about 32Mb/s throughput or better, but if we
enable the cache for the EMC RAID, we only get 8Mb/s or less.  This doesn't
happen if we use JFS, where we get a little less than 32Mb/s throughput with or
without cache enabled, on the same hardware and CentOS, but there are some
features in XFS that we use that are not available in JFS..



Any thoughts on this?



Thanks.



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