2120S poor performance

David O'Brien obrien at freebsd.org
Fri Dec 10 17:08:54 PST 2004

On Thu, Dec 09, 2004 at 12:50:55PM -0600, Jon Noack wrote:
> Bill Anderson wrote:
> > I've got a 3x72g RAID5 array with U320 disks on an Adaptec 2120S
> > controller under Freebsd 4.10.  I'm getting about 25MB/s for sequential
> > What's the cheapest controller that still gives reasonable performance?
> > (If you could give a couple different ones, with their associated
> > performance (under FreeBSD), or tell me where to find such information,
> > that would be great)
> The asr driver is in need of a lot of attention.
> There are many quality, (relatively) cheap controllers out there, but if
> you're looking to stick with Adaptec get a 2130S.  The 2130S uses the aac
> driver, which is quite well tuned and maintained by Scott Long.

The Adaptec SCSI RAID 2120S is not an I2O(asr) controller -- it is an
aac(4) controller.  The 'out of market' controller mentioned in this
thread is the work horse 5400S.

-- David  (obrien at FreeBSD.org)

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