On Wed, 19 Sep 2012 16:25:57 +1000 NeilBrown <neilb@xxxxxxx> wrote: > RAID5/RAID6 write speed is never going to be brilliant, but there probably is > room for improvement. Hopefully one day I figure out how to effect that > improvement. "/sys/block/md*/md/stripe_cache_size" is absolutely the first thing one should look at when facing a problem with md RAID5/6 write performance. It is understandable that the default value can't be high (as it consumes a lot of RAM on large disk counts), but increasing it if you have the RAM can increase the write speed by 200 to 400%: http://peterkieser.com/2009/11/29/raid-mdraid-stripe_cache_size-vs-write-transfer/ -- With respect, Roman ~~~~~~~~~~~~~~~~~~~~~~~~~~~ "Stallman had a printer, with code he could not see. So he began to tinker, and set the software free."
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