From mboxrd@z Thu Jan  1 00:00:00 1970
From: geoff@collyer.net
To: 9fans@collyer.net
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Message-Id: <20010831224649.CBC3B199E4@mail.cse.psu.edu>
Subject: [9fans] disk mirroring
Date: Fri, 31 Aug 2001 15:46:45 -0700
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Does anybody have experience with the fancier Promis IDE controllers?
One line (FastTrak?) claims to implement drive mirroring, but I
don't know if this requires OS intervention, or if it just works
once you configure it via the Promis BIOS.

I've just got a version of nemo's IDE file server up and running
on a system with 2 20GB IDE drives.  I've added optional mirroring
and that seems to work (I haven't yet done a thorough verification)
at a performance penalty of 8-9% real time.  I just copied 275MB into
the main file system; so far everything seems to be working right.