On Mon, Jan 17, 2005 at 04:24:47PM +0000, Andrew Walrond wrote: > FWIW I get these results with RAID-0 > > andrew@orac ~ $ sudo hdparm -t /dev/sda /dev/sdb /dev/md0 > > /dev/sda: > Timing buffered disk reads: 170 MB in 3.00 seconds = 56.64 MB/sec > > /dev/sdb: > Timing buffered disk reads: 170 MB in 3.02 seconds = 56.37 MB/sec > > /dev/md0: > Timing buffered disk reads: 236 MB in 3.02 seconds = 78.08 MB/sec As an aside, when I try this, how come I get this: $ sudo hdparm -t /dev/sda /dev/sdb /dev/md0 /dev/sda: Timing buffered disk reads: 152 MB in 3.03 seconds = 50.19 MB/sec HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate ioctl for device /dev/sdb: Timing buffered disk reads: 152 MB in 3.03 seconds = 50.24 MB/sec HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate ioctl for device /dev/md0: Timing buffered disk reads: read(2097152) returned 524288 bytes (note warnings about ioctls and no speed output for /dev/md0) These are SATA drives in a RAID 1.
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