A while back I posted a script that does individual send/recvs
for each file system, sending incremental streams if the remote
file system exists, and regular streams if not.
The reason for doing it this way rather than a full recursive
stream is that there's no way to avoid sending certain file
systems such as swap, and it would be nice not to always send
certain properties such as mountpoint, and there might be file
systems you want to keep on the receiving end.
The problem with the regular stream is that most of the file
system properties (such as mountpoint) are not copied as they
are with a recursive stream. This may seem an advantage to some,
(e.g., if the remote mountpoint is already in use, the mountpoint
seems to default to legacy). However, did I miss anything in the
documentation, or would it be worth submitting an RFE for an
option to send/recv properties in a non-recursive stream?
Oddly, incremental non-recursive streams do seem to override
properties, such as mountpoint, hence the /opt problem. Am I
missing something, or is this really an inconsistency? IMO
non-recursive regular and incremental streams should behave the
same way and both have options to send or not send properties.
For my purposes the default behavior is reversed for what I
would like to do...
Thanks -- Frank
Latest version of the script follows; suggestions for improvements
most welcome, especially the /opt problem where source and destination
hosts have different /opts (host6-opt and host5-opt here) - see
ugly hack below (/opt is on the data pool because the boot disks
- soon to be SSDs - are filling up):
#!/bin/bash
#
# backup is the alias for the host receiving the stream
# To start, do a full recursive send/receive and put the
# name of the initial snapshot in cur_snap, In case of
# disasters, the older snap name is saved in cur_snap_prev
# and there's an option not to delete any snapshots when done.
#
if test ! -e cur_snap; then echo cur_snap not found; exit; fi
P=`cat cur_snap`
mv -f cur_snap cur_snap_prev
T=`date "+%Y-%m-%d:%H:%M:%S"`
echo $T > cur_snap
echo snapping to sp...@$t
echo Starting backup from sp...@$p to sp...@$t at `date` >> snap_time
zfs snapshot -r sp...@$t
echo snapshot done
for FS in `zfs list -H | cut -f 1`
do
RFS=`ssh backup "zfs list -H $FS 2>/dev/null" | cut -f 1`
case $FS in
"space/<file system to skip here>")
echo skipping $FS
;;
*)
if test "$RFS"; then
if [ "$FS" = "space/swap" ]; then
echo skipping $FS
else
echo do zfs send -i $...@$p $...@$t I ssh backup zfs recv -vF $RFS
zfs send -i $...@$p $...@$t | ssh backup zfs recv -vF $RFS
fi
else
echo do zfs send $...@$t I ssh backup zfs recv -v $FS
zfs send $...@$t | ssh backup zfs recv -v $FS
fi
if [ "$FS" = "space/host5-opt" ]; then
echo do ssh backup zfs set mountpoint=legacy space/host5-opt
ssh backup zfs set mountpoint=legacy space/host5-opt
fi
;;
esac
done
echo --Ending backup from sp...@$p to sp...@$t at `date` >> snap_time
DOIT=1
while [ $DOIT -eq 1 ]
do
read -p "Delete old snapshot <y/n> " REPLY
REPLY=`echo $REPLY | tr '[:upper:]' '[:lower:]'`
case $REPLY in
"y")
ssh backup "zfs destroy -r sp...@$p"
echo Remote sp...@$p destroyed
zfs destroy -r sp...@$p
echo Local sp...@$p destroyed
DOIT=0
;;
"n")
echo Skipping:
echo " "ssh backup "zfs destroy -r sp...@$p"
echo " "zfs destroy -r sp...@$p
DOIT=0
;;
*)
echo "Please enter y or n"
;;
esac
done
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