With mirroring you can loose several drives, an entire cage, or a
controller and still not go down, that is if you mirror at least at the
controller level. However if you loose two drive in the same raid set,
or any upstream hardware, you are down until repair. If you loose two
drives in the same raid set, you are reloading that ASP/entire system.
As for replacing the battery, you should force the error to disable and
flush the cashe to be safe, that is to prevent loosing data if the power
should fail in the minute you have the battery out. (It does happen.)
Old controllers you had to remove the card to get to the battery, new
cards are accessable with the card in place, in fact I think you can get
to them with the covers on.
Christopher Bipes
Information Services Director
CrossCheck, Inc.
-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[
mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of rob@xxxxxxxxx
Sent: Monday, June 04, 2007 1:30 PM
To: Midrange Systems Technical Discussion
Subject: RE: CACHE BATT EXP 90 DAYS???
Honestly I've lost several disk drives under RAID. However, I've
experienced no downtime because of it. The drives were hot replaced and
the users didn't notice a thing. Just trying to find out what the big
advantage is to mirroring. I thought with mirroring when you lost a
drive, you still didn't lose data, but you did have to drop the system
to replace the drive. I hope I am misinformed because I fail to see the
advantage in that. Perhaps that's just how it used to be?
midrange.com
