topic Re: Restoring tape using tar in Operating System - HP-UX

Restoring tape using tar

Henry_52 — Wed, 01 Sep 2004 16:29:28 GMT

Hi,

I took backup using tar

$tar -cvf /dev/rmt/0m /oracle

Now I have new directory /test. And I want to restore my backup into /test.
I have run tar xvf /dev/rmt/0m /test
or tar xvf /dev/rmt/0m .
But it is not working. It is not
doing anything , not restoring.

If I do "tar xvf /dev/rmt/0m /oracle , than it's start restoring backup but in to /oracle.

How can I restore backup into other directory ?

Thank you.

Henry

Re: Restoring tape using tar

Sundar_7 — Wed, 01 Sep 2004 16:48:31 GMT

Henry,

With tar, if you use the absolute path name to backup the file, then you can only restore it to the absolute path.

You will have to use pax to restore it to a relative path

# cd /test
# pax -rf /dev/rmt/0m -s '|^/|\./|'

the above command will restore the files from the tape relative to the /test directory

-- Sundar.

Re: Restoring tape using tar

john kingsley — Wed, 01 Sep 2004 16:48:43 GMT

HP's tar doesn't have an option to restore the directory as something else.
Try this:
cd /
tar -cvf /dev/rmt/0m ./oracle
cd /test
tar -xvf /dev/rmt/0m
This will put the data in /test/oracle

Re: Restoring tape using tar

Jason_216 — Wed, 01 Sep 2004 19:55:53 GMT

tar is not a good command in HP UX,

u can use the both fbackup and frecover command in HP unix

to backup
# fbackup -f /dev/rmt/0m -i /oracle

to restore everything back to /oracle
# frecover -f /dev/rmt/0m -r

but if u still want to use tar
# tar -xvf /dev/rmt/0m ./oracle

Re: Restoring tape using tar

Muthukumar_5 — Thu, 02 Sep 2004 00:44:39 GMT

You have taken archieve as absolute path /oracle/*

When if you try to extract then it will do it exactly /oracle/

You can change that as,
cd /;
tar -cvf /dev/rmt/0m oracle

or
tar -cvf /dev/rmt/0m ./oracle

To extract under /test then,
mkdir /test
cd /test
tar -xvf /dev/rmt/0m

It will now extract as /test/oracle/*

Re: Restoring tape using tar

Sยภเl Kย๓คг — Thu, 02 Sep 2004 06:52:57 GMT

Yes this is the way

#tar -cvf /dev/rmt/0m ./oracle
#cd /test
#tar -xvf /dev/rmt/0m

regards
SK

Re: Restoring tape using tar

RAC_1 — Thu, 02 Sep 2004 07:06:46 GMT

The tar backups taken with absolute paths will be restored to original path. The tar can not exclude / in tar archive.

You can try as follows.

1. Use of pax
cd /where_to_resore
pax -rv -s '/^\///' < your.tar

2. Use GNU tar.
Take care of block size.

3. Use of chroot environment
/usr/bin/cp /usr/sbin/static/tar /tmp
/usr/bin/dd if=file.tar | /usr/bin/chroot /tmp ./tar xf -

Anil

Re: Restoring tape using tar

Henry_52 — Thu, 02 Sep 2004 09:59:24 GMT

Thank you for your quick reply.
Because I can't backup again,
I have to restore tar tapes.
According to Sundar's reply,
I could restore tapes using pax command.
Thank you very much Sundar !!!

Henry