Date: Sat, 9 Sep 2006 14:52:34 +0100 From: "Steven Hartland" <killing@multiplay.co.uk> To: "Mark Kirkwood" <markir@paradise.net.nz> Cc: amd64@freebsd.org, Jo Rhett <jrhett@svcolo.com>, stable@freebsd.org Subject: Re: suggestions for SATA RAID cards Message-ID: <079e01c6d417$3890fc40$b3db87d4@multiplay.co.uk> References: <44EC0B9B.5020705@withagen.nl> <003f01c6c68d$64688e60$b3db87d4@multiplay.co.uk> <20060907184316.GC56998@svcolo.com> <035701c6d2c3$eb574aa0$b3db87d4@multiplay.co.uk> <FEDA1103-8D83-4D43-9731-7E3D9D2DB1E5@svcolo.com> <001001c6d327$25dc07c0$b3db87d4@multiplay.co.uk> <4502123D.705@paradise.net.nz>
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Mark Kirkwood wrote:
> Just out of interest what RAID level was the 5 disk array? - as
> 180Mb/s from an Areca 5 disk RAID0 or RAID5 array is not that good -
> my old 3Ware 7506 with 4 Maxtor IDE RAID0 gets 175Mb/s. Obviously if
> your array is RAID10, the 180MB/s is very good!
>
> 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
So for the money they HighPoint is nothing to be sneezed at.
Of course this is a very crude test not comparing totally like for
like. Under load the Areca is quicker and has the flexibility of
online capacity expansion and raid level migration but...
Steve
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