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Date:      Fri, 28 Nov 1997 10:54:18 -1000 (HST)
From:      "David Langford" <langfod@dihelix.com>
To:        asami@cs.berkeley.edu (Satoshi Asami)
Cc:        jamil@trojanhorse.ml.org, hackers@FreeBSD.ORG
Subject:   Re: Drive Mirroring
Message-ID:  <199711282054.KAA25809@dihelix.com>
In-Reply-To: <199711282014.MAA21785@silvia.HIP.Berkeley.EDU> from Satoshi Asami at "Nov 28, 97 12:14:14 pm"

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> * 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

Any thought on what is required to make a "snapshot" feature in FreeBSD?

-David Langford
 langfod@dihelix.com




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