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From: Doug Ambrisko <ambrisko@ambrisko.com>
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To: Scott Long <scottl@freebsd.org>
Date: Wed, 12 Jan 2005 12:04:26 -0800 (PST)
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cc: freebsd-scsi@freebsd.org
cc: KC Somaratne <kc.somaratne@gmail.com>
Subject: Re: Fwd: Recommended RAID controller
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Scott Long writes:
| I really don't know what I'd recommend.  The aac cards seem to be 'good
| enough' for most people.  The amr driver is suffering from instability
| under heavy load, unfortunately.  The ciss hardware and drivers are
| pretty good, but are somewhat hard to get ahold of.

FYI, I've seen amr based Dell servers that interrupt storm.  The use pattern
seems to be heavy disk and network traffic triggers it.  The storm is
triggered on the 3rd USB controller and the amr controller.  I've worked
around it locally in 4.X here so the amr controller idles out until the
storm is over then resumes operations again.

I haven't ported it to 6.X/5.X yet.  The problem seems less severe in
5.X.

Utilities to manage and monitor the amr controller tend to be buggy 
and/or not available for FreeBSD.  I've found bugs in the latest Linux 
versions.

Doug A.