CentOS - Mar 2007 - Performance problem with CentOS and XFS on EMC

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.

 

-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.centos.org/pipermail/centos/attachments/20070308/cf2af2f3/attachment.html>

On Thu, 8 Mar 2007 at 4:50pm, Mark Hull-Richter wrote
> We have an appliance that uses the CentOS 4.4 Plus kernel with XFS on an
The first thing you want to ensure is that you're using the XFS kernel 
module avaiable in the plus repository and not XFS as compiled in the plus 
kernel.  The module code is *much* newer and less likely to be broken.

-- 
Joshua Baker-LePain
Department of Biomedical Engineering
Duke University