This is just slightly off topic, I have 2 machines rhel4 and 5 on them, hdparm shows the one as way faster than the other, but doing large file copys and du -sh on huge directories proves the opposite:
# hdparm -Tt /dev/sdc2 /dev/sdc2: Timing cached reads: 3268 MB in 2.00 seconds = 1633.43 MB/sec Timing buffered disk reads: 422 MB in 3.00 seconds = 140.55 MB/sec ]# hdparm -Tt /dev/sda1 /dev/sda1: Timing cached reads: 13260 MB in 2.00 seconds = 6639.86 MB/sec Timing buffered disk reads: 988 MB in 3.00 seconds = 329.14 MB/sec The first one is a SATA 12 raid 6 array, the second one is a SATA 6 x 750GB raid 5 array. I can understand 12 drives should provide more iops, but this makes no sense.
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