Ben Martin wrote:
Hi, Apologies if posting this here is inappropriate but a recent article of mine compares the Linux Kernel RAID code to an $800 hardware RAID card and might be of interest to list members: http://www.linux.com/feature/140734
Very interesting. Btw - did you use stripe-width on ext3s as well, or only stride ?
Also looking back at other benchmarks, stripe_cache_size can have pretty tremendous effect on md raid performance. There're other settings that could matter as well (read ahead, queue depths). It would be interesting to see e.g. raid5 256k chunk comparison, done with those altered ( _especially_ md's stripe_cache_size with some high value like 16384 or 32768), and with stripe-width used in ext3 case (if it wasn't used already).
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