Re: RAID10 far (f2) read throughput on random and sequential / read-ahead

2008-02-23 Thread Nat Makarevitch
Nat Makarevitch makarevitch.org> writes: > 'md' performs wonderfully > random access performance remains stable and high (450 > IOPS with 48 threads, 20% writes - 10% fsync'ed), even with a fairly high > read-ahead (16k). Mystery solved, sorry for the noise Ex

RAID10 far (f2) read throughput on random and sequential / read-ahead

2008-02-21 Thread Nat Makarevitch
'md' performs wonderfully. Thanks to every contributor! I pitted it against a 3ware 9650 and 'md' won on nearly every account (albeit on RAID5 for sequential I/O the 3ware is a distant winner): http://www.makarevitch.org/rant/raid/#3wmd On RAID10 f2 a small read-ahead reduces the throughput on se