Date: Fri, 28 Nov 1997 18:33:05 -0800 (PST) From: "Jamil J. Weatherbee" <jamil@trojanhorse.ml.org> To: Satoshi Asami <asami@cs.berkeley.edu> Cc: hackers@freebsd.org Subject: Re: Drive Mirroring Message-ID: <Pine.BSF.3.96.971128183133.889A-100000@trojanhorse.ml.org> In-Reply-To: <199711282014.MAA21785@silvia.HIP.Berkeley.EDU>
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One problem with this: If the system is rebooted with only one drive it crashes, second you cannot do a out of the box install on ccded drives so they are pretty useless tom me for anything but data. I actually tried the exact scenario you suggest. On Fri, 28 Nov 1997, Satoshi Asami wrote: > * and dump | restore to it. Can anyone think of a way I could maintain an > * entire mirrored system without ccd, perhaps some software that nightly > * looks at the changes on one drive and puts them over to the second without > * basically rewriting the whole thing. > > Partition the drives as root / the rest, ccd the two "rest" partitions > and partition them as you wish (/var, /usr, /usr/local, etc.). Write > a script that does the following every night: > > newfs /dev/rsd1a > mount -o async /dev/sd1a /mnt > cd / > find -dx . | cpio -dump /mnt > umount /mnt > > Granted, this will leave a small window of vulnerability during the > script is running, but if the root partition is small enough, it > should be real quick. > > Satoshi >
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