On Thu, 2003-08-28 at 23:39, Jason Dixon wrote:
> Does anyone have a good example of using mt with EOF markers to create
> multiple tar archives (one full, multiple incrementals) on a single tape
> drive? Please, no suggestions of using dump/restore or Amanda. I'd
> like to get this working as-is.
I didn't get any suggestions on this, but I managed to get it working.
I'm posting this for archival purposes as a brief HOWTO for backing up
data to a tape drive using mt and tar (rather than dump).
Obviously, mt is used to perform actions on the tape drive and media.
We can use mt to fast-forward between files, records and "marks". In my
case, I wished to setup a weekly backup schedule consisting of a full
backup on Monday and incremental backups for daily changes on
Tuesday-Sunday. Once the final backup is performed on Sunday, the tape
will be rewound and ejected.
However, since I'm using tar to copy files directly onto the tape,
rather than compressing them into a single archive, we need a way to
mark the end of one day's backups prior to starting the next day's. To
do this, we simply append an EOF to the end of the day's backup. This
gives us a way of safely navigating between archives, using the "mt -f
/dev/nst0 fsf" command.
I'm appending my backup script in the hopes that others may benefit from
it. If anyone has questions or suggestions, please don't hesitate to
contact me.
#!/bin/bash
####################################
# Define our vars
# You'll want to set DIRS
####################################
YESTERDAY=`date +'%d %b %Y'`
DIRS="/etc /home /root /var"
START=`date +%s`
echo "*** Starting Backup - `date` ***"
####################################
# Check drive status
####################################
if [ `mt -f /dev/nst0 status | grep -c ONLINE` == 0 ]; then
echo "Drive is OFFLINE, exiting!"
exit 1
fi
####################################
# We don't want sockets,
# save for later
####################################
find $DIRS -type s > /tmp/backup-sockets.list
####################################
# Start backups
####################################
if [ `date +%u` == 1 ]; then
# It's Monday, let's erase and do full backup!
mt -f /dev/st0 rewind
mt -f /dev/st0 retension
mt -f /dev/st0 erase
tar cpf /dev/nst0 $DIRS -P -W -X /tmp/backup-sockets.list
mt -f /dev/nst0 eof
else if [ `date +%u` == 7 ]; then
# It's Sunday, let's do an incremental and eject
tar cpf /dev/nst0 --newer '$YESTERDAY' $DIRS -P -W -X
/tmp/backup-sockets.list
mt -f /dev/nst0 eof
mt -f /dev/st0 rewoffl
else
# Let's do an incremental backup
tar cpf /dev/nst0 --newer '$YESTERDAY' $DIRS -P -W -X
/tmp/backup-sockets.list
mt -f /dev/nst0 eof
fi
echo "*** Backup Complete - `date` ***"
####################################
# Compute time and report
####################################
END=`date +%s`
DIFF=$((FINISH - START))
echo -n "***** Total Run Time: "
HRS=`expr $DIFF / 3600`
MIN=`expr $DIFF % 3600 / 60`
SEC=`expr $DIFF % 3600 % 60`
if [ $HRS -gt 0 ]; then
echo -n "$HRS hrs "
fi
if [ $MIN -gt 0 ]; then
echo -n "$MIN mins "
fi
if [ $SEC -gt 0 ]; then
echo -n "$SEC secs "
fi
####################################
# End of Script
####################################
--
Jason Dixon, RHCE
DixonGroup Consulting
http://www.dixongroup.net
--
redhat-list mailing list
unsubscribe mailto:[EMAIL PROTECTED]
https://www.redhat.com/mailman/listinfo/redhat-list
