Steven Hartland wrote:
Mark Kirkwood wrote:
If you are using RAID0|5, then something is slowing you down (possible
clash between disk firmware and the Areca, or unfortunate choice of
strip chunk size).
Dont know which test I was remembering but just did a quicky:
OS: FreeBSD 6.1
RAID: 5 on 5 * 400GB Seagate
Controller: HighPoint 1820a
CPU: Dual Opteron 244
RAM: 2Gb
/usr/bin/time -h dd if=/dev/da0 of=/dev/null bs=1048576 count=10000
10000+0 records in
10000+0 records out
10485760000 bytes transferred in 44.887239 secs (233602250 bytes/sec)
44.88s real 0.03s user 2.40s sys
In comparison:
OS: FreeBSD 5.4
RAID: 5 on 6 * 300GB Seagate
Controller: Areca 1120
CPU: Dual Opteron 248
RAM: 4Gb
/usr/bin/time -h dd if=/dev/da0 of=/dev/null bs=1048576 count=10000
10000+0 records in
10000+0 records out
10485760000 bytes transferred in 81.598938 secs (128503633 bytes/sec)
1m21.60s real 0.00s user 2.69s sys
Hmmm - I've found that FreeBSD 6.1 is a considerably better performer
than 5.4, so that is not helping the comparison above.
Another thing to check is that both systems have the same vfs.read_max
sysctl tunable, as that makes quite a difference on RAID systems!
If you have the time to keep playing with these machines, it might be
interesting to try block sizes other than 1M - could expose different
behavior too!
Cheers
Mark
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