Just to advance in a tape

[Sebastian_23]

Hi,
I´m here again.

My doubt is about when I made a backup during one week (7 days backup).
If I want to restore, for example, the 3 day of the backup.
How do I reach that day?. I tried mt -f /dev/... fsr 3, but I couldn't get the information I wanted.

Pls I need your help.
Again thks in advance.

Sebasti

[Ralf Puchner]

so it seems you used the rewind device instead of the norewind devices.

Have a look into the admin guide explaining backup and devices in detail.

[Michael Schulte zur Sur]

Hi Sebasti,

assuming you have done the backup right(like Ralf said), to advance you can either do

vrestore -ivf /dev/nrmt0h
if not the right backup yet, use
restore
to get to the next backup without adding files

To get straight to the nth backup you have to
mt -f /dev/nrmt0h fsf n-1

greetings,

Michael

ps. please tell us how you do the backup!

[Mohamed K Ahmed]

Sebastian,
To use one tape to backups several save sets (ie 7 days worth of backups), you have to use the non rewind option in the backup command
vdump -f /dev/nrmt0h .......

to restore a specific day, from the begining of the tape count how many jumps (#) you have to do to reach the begining of the day you want to restore and issue the command
mt -f /dev/nrmt0h fsf #
then
vrestore -i -f /dev/nrmt0h and go from there

For example
day1.....day2.....day3....day4....day5

to restore data from day 3, n should be 2

HTH

Mohamed

[Eric van Dijken]

Using "mt -f /dev/ntape/ntape0 fsf 3" might work better, please check the man page for mt for how to use it correctly.

off-topic:
Using only one tape for a week backup is (most of the time) not really a smart thing to do. When the tape is destroyed (it will happen), you will loose the backups for that whole week. Try to change the tape on a daily basis.