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Re: PR/45162 CVS commit: src/sys/dev/raidframe
The following reply was made to PR bin/45162; it has been noted by GNATS.
From: Greg Oster <oster%netbsd.org@localhost>
Subject: Re: PR/45162 CVS commit: src/sys/dev/raidframe
Date: Fri, 23 Jul 2021 16:42:18 -0600
It turns out the 'fix' for this PR is not as obvious as it once seemed.
RAIDframe *does* support RAID 1 with more than 2 components, but not in
the way one might expect. Given six components: a, b, c, d, e, and f,
RAIDframe will create a 2-dimensional array, where the concatenation of
a, c, and e will be mirrored by the concatenation of b, d, and f.
Where things are falling apart is with an odd number of components,
which now fails (until someone writes a n-way RAID 1 for RAIDframe).
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