* performance of raid10,f2 on 4 disks
@ 2008-01-23 18:21 Keld Jørn Simonsen
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From: Keld Jørn Simonsen @ 2008-01-23 18:21 UTC (permalink / raw)
To: linux-raid
Hi!
I have played around with raid10,f2 on a 2 disk array set,
and I really liked the performance on the sequential reads.
It looked like double up on the speed, about 173 MB/s
for two SATA-2 disks.
I then went on to look at my 4 new SATS-2 disks, to have
the same kind of performance I made the array by:
mdadm --create /dev/md3 --chunk=256 -R -l 10 -n 4 -p f2 /dev/sd[abcd]1
And my first tests showed a sequential read rate of 320 MB/s.
Impressive! I then tried it a few more times, but then I could not
get more than around 160 MB/s, which is less than what I got on 2 disks.
Any ideas of what is going on?
Best regards
keld
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