On Wed, 16 Jun 2010 18:23:36 -0400 aragonx@xxxxxxxxxx wrote: > Before I start spewing server information, my question is this. Is there > anything I can tweak to improve my performance? It seems that the server > is CPU bound when I am transferring large amounts of data to or from it. > Any suggestions will be considered. Faster processor, switching to RAID > 0, etc. I'm hoping there is something I can do with the RAID software > though. Maybe a different chunk size or different algorithm? Increasing stripe cache size from the default of 256 should help immensely. echo 16384 > /sys/block/md0/md/stripe_cache_size Be warned that this consumes (^that amount * 4096 * number of disks) bytes of RAM. Some benchmarks: http://peterkieser.com/2009/11/29/raid-mdraid-stripe_cache_size-vs-write-transfer/ On a related note -- Neil, are there plans to implement a stripe cache which would be shared between all RAID devices? I have two RAID5s in my system, and when one has a lot of writes, the other is often idle (or vice versa), so that array's stripe cache is just sitting there wasting memory. Would be nice to be able to have a shared pool of RAM for stripe-caching all the arrays and the active one(s) using it to the fullest. -- With respect, Roman
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