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Date:      Tue, 23 Jan 2001 18:38:23 +0000
From:      Geoff Buckingham <geoffb@chuggalug.clues.com>
To:        Greg Rumple <grumple@zaphon.llamas.net>
Cc:        Mike Smith <msmith@FreeBSD.ORG>, Alfred Perlstein <bright@wintelcom.net>, stable@FreeBSD.ORG
Subject:   Re: Dell PERC 3 support?
Message-ID:  <20010123183823.A75088@chuggalug.clues.com>
In-Reply-To: <20010123092236.C84940@zaphon.llamas.net>; from Greg Rumple on Tue, Jan 23, 2001 at 09:22:37AM -0800
References:  <20010123012109.O26076@fw.wintelcom.net> <200101231715.f0NHF1S00658@mass.dis.org> <20010123092236.C84940@zaphon.llamas.net>

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I was one of the people with trouble before christmas. 

Following mike's stirling work they seem to function well in 
recent stable snapshots. At the time I last installed
the GENRIC kernel and sysinstall didn't have the aac configured
so I had to use a set of current install floppies having
changed options/Release Name to correspond to the stable 
snapshot I required.


There are  couple of things to know about Dell PERC controllers.

PERC stands for Power Edge Raid Controller. Hence can be anything
Dell decice to rebadge. Currently this seems to be restricted to
the aac (adaptec) and amr (AMI).

The PE2450 has an onboard aac that is enabled with a "raid key'
and and a DIMM. This is the PERC3/si.

THis seems to be a reasonable controller, the drivers reporting 
seems to suggest actual PCI controllers of this family may have
a battery to protect the uncommited data data in the (large) cache,
while this does not. (Write cacheing can be disabled.)

While there is no native freebsd managment tool for this card,
work is well under way on getting the linux one working and
most tasks can be initiated in the contollers bios at boot time
and left to happen in the background while FreeBSD runs on the
'degraded' . This means a reboot would be required for most
recovories, thogh much of it may be able to occur with
the machine up and running.

I am not sure of the state of managment tools for the other 
RAIDS, if you have the time and budget to pick and choose
this is an importent criterea.

-- 
GeoffB


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