Date: Fri, 31 Jul 1998 15:34:37 -0400 (EDT) From: "Daniel T. Hagan" <dhagan@vt.edu> To: questions@FreeBSD.ORG Subject: Disk mirroring with ccd Message-ID: <Pine.OSF.3.96.980731152549.9938A-100000@rottweiler.cslab.vt.edu>
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>From the man page for ccd(8):
Disk Mirroring
You can configure the ccd to ``mirror'' any even number of disks.
See ccdconfig(8) for how to specify the necessary flags. In an event of a
disk failure, you can use dd(1) to recover the failed disk. Note that a
one-disk ccd is not the same as the original partition. In particular,
this means if you have a filesystem on a two-disk mirrored ccd and one of
the disks fail, you cannot mount and use the remaining partition as
itself; you have to configure it as a one-disk ccd.
Just to be sure I understand what this is saying, if I have:
ccd0 ?? CCDF_MIRROR /dev/sd1e /dev/sd2e
as the configuration, and sd1 fails, can I change the configuration to:
ccd0 ?? none /dev/sd2e
And recover the data from ccd0?
As an added question, how does interleaving affect disk mirroring under
ccd? Any recommended values?
Please cc: a reply directly to me, as I don't read the list on a regular
basis.
Thanks,
Daniel Hagan
---
Daniel Hagan http://www.acm.vt.edu/~dhagan Head Admin ACM
dhagan@vt.edu Virginia Tech
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