On Sun, 25 Jul 2010 14:58:37 +0000 (GMT) Marco <jjletho67-diar@xxxxxxxx> wrote: > doing a simple performance tests i obtained some very unexpected results: if > i issue hdparm -t /dev/md2 i obtain 61 - 65 MB/s while issuing the same test > directly on the partitions which compose md2 (/dev/sda3 and /dev/sdb3) i > obtain 84 - 87 MB/s. I didn't expect a so big difference between md2 and one > of its member. What can cause this difference ? Maybe their read-ahead settings are different? Check out "blockdev --getra /dev/md2", and compare that with the same setting of the member disks. You can experiment with changing it by using "--setra" as well. -- With respect, Roman
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