Date: Wed, 20 Sep 2000 15:20:40 -0600 From: Lyndon Nerenberg <lyndon@orthanc.ab.ca> To: Edward Elhauge <ee@uncanny.net> Cc: freebsd-hackers@FreeBSD.ORG, freebsd-isp@FreeBSD.ORG Subject: mirroring / (was Re: Frustration with SCSI system) Message-ID: <200009202120.e8KLKe109103@orthanc.ab.ca> In-Reply-To: Your message of "Wed, 20 Sep 2000 13:24:34 PDT." <200009202024.NAA45822@ns2.uncanny.net>
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>>>>> "Edward" == Edward Elhauge <ee@uncanny.net> writes:
Edward> OK, vinum is good. But my understanding is that you can't
Edward> use vinum on your root partition. By Murphy's Law it
Edward> always seems to be root that gets screwed up. And that
Edward> also causes the biggest problems because then you have to
Edward> yank the system apart and find another host disk for
Edward> booting.
Keep a spare root partition on another disk. If both disks (real root and
spare root) have the same geometry, and you allocated identically sized
root filesystems, you can dd the live root partition to the spare from
cron. If they aren't the same size you would need to keep the spare
mounted and do a 'dump ... | restore ...' instead.
Alternatively, forgo all the cron-based sync magic (which *is* a bit
dodgy when you're copying a live filesystem) and just manually sync the
spare root to the real root whenever you make significant changes (new
kernel, password file updates, etc).
--lyndon
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