zfs discuss - Mar 2008 - zfsdump

I wrote a simple script to dump zfs snapshots in a similar way to
what I did with ufsdump.  In particular, it supports dump levels.
This is still very crude, but I''d appreciate comments.  Does what
I''m doing make sense, or do I misunderstand zfs?

Thanks.


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#!/bin/ksh
#
# XXX - real option parsing
#
level=$1
fs=$2
snap="$fs at level-$level"
zfs destroy "$snap" >/dev/null 2>&1
zfs snapshot "$snap"
base="$fs at origin"
#
# find the newest numbered dump snapshot that exists
#
((i=level-1))
basecr=0
while ((i>=0))
do
         if zfs list -H -o name -t snapshot "$fs at level-$i"
>/dev/null 2>&1
         then
                 cr=`zfs get -Hp -o value creation "$fs at level-$i"`
                 if ((cr > basecr))
                 then
                         base="$fs at level-$i"
                         basecr=$cr
                 fi
         fi
         ((i=i-1))
done
echo >&2 zfs send -R -v -i "$base" "$snap"
zfs send -R -v -i "$base" "$snap"

The real problem for us is down to the fact that with ufsdump and ufsrestore
they handled tape spanning and zfs send does not.

we looked into having a wrapper to "zfs send" to a file and running
gtar (which does support tape spanning), or cpio ... then we looked at the
amount we started storing with ZFS and decided to just use external ZFS hard
drivers (mirrored) and stick them in a big tape safe when they''re full.
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