Brad DerManouelian wrote:
My point is that RAID 5 is *MUCH* slower than just about any other RAID
config and you should expect your max speed to be half of your fastest
drive.
That's not necessarily true.
Raw disk (Slower machine, but same disk):
/dev/sda:
Timing cached reads: 1096 MB in 2.01 seconds = 545.09 MB/sec
Timing buffered disk reads: 178 MB in 3.01 seconds = 59.13 MB/sec
RAID5:
/dev/sda:
Timing cached reads: 2108 MB in 2.00 seconds = 1052.06 MB/sec
Timing buffered disk reads: 202 MB in 3.04 seconds = 66.37 MB/sec
This is in a 8 disk (200Gb Barracuda IVs) hptmv SATA RAID5, which I believe
MAY (despite what the FAQ says) be semi-hardware RAID.
Cheers,
Allan.
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