tar file

[peterchu]

I use the tar command to backup files to the tape , and set the error checking , if no error code then generate a file (success.$br_date) ,the below is the script , I also want to backup this file (success.$br_date) to the tape , ( because I found the tape already eject after it completed tar process ) , what can i do? thx

tar -cvf /dev/rmt/0m

if [ $? -eq 0 ] ;
then
echo SUCCESS Backup on $(hostname) from $br_sttime to `date "+%a %Y/%m/%
d %T"` ,Result is 0 >> /tmp/success.$br_date

[Mark Grant · Accepted solution]

Well, if you use the no-rewind device /dev/rmt/0mn, the tape will not rewind and eject. You can then do a second "tar" to backup the additional file. Use the normal device for the second backup.

However, to restore that file you will have to skip past the first backup using "mt -t /dev/rmt/0mn fsf 1" and then restore.

[peterchu]

thx reply , another question , how can I know whether the tape is still inside the drive or has been ejected from the drive , ( as I am in the remote site to do the testing ) ? thx.

[Borislav Perkov]

Hi,
with

mt -f /dev/rmt/0m rewind > /dev/null
if test $? -eq 0
then
# tape is inside
# commands
fi

Regards

[Steven E. Protter]

tar tvf /dev/rmt/0m

If the tape is in the $? will be 0 if not, it will be not zero.

Crude but effective.

SEP

[Mark Grant]

Or even

diskinfo /dev/rmt/0mn