topic Re: tar ? in Operating System - HP-UX

tar ?

fizan — Fri, 04 Dec 2009 16:58:51 GMT

# tar -tvf /dev/rmt/0m
Tar: blocksize = 2
directory checksum error

thanks.

Re: tar ?

Pete Randall — Fri, 04 Dec 2009 17:04:18 GMT

Try rewinding first:

mt -f /dev/rmt/0m rew

Pete

Re: tar ?

OldSchool — Fri, 04 Dec 2009 17:30:59 GMT

Some possibilities:

it may not be positioned at the beginning of the tar file on tape.

Are you sure it is a tar file?

If it was created on some other system, its possible that it was written w/ GNU version and the "compress/zip" option was set. If that's the case, recreate the tape w/o that flag (althought it may be possible to use dd and gzip to read the tape get that sent to tar...I've not tried that though)

Re: tar ?

Kranti Mahmud — Sun, 06 Dec 2009 09:30:56 GMT

Hi fizan,

Check the following thread:

http://forums11.itrc.hp.com/service/forums/questionanswer.do?admit=109447626+1260091792986+28353475&threadId=833785

Rgds-Kranti

Re: tar ?

Torsten. — Mon, 07 Dec 2009 06:07:03 GMT

Is this an IGNITE tape? Made on HP9000 or Integrity?

Re: tar ?

James R. Ferguson — Mon, 07 Dec 2009 15:16:49 GMT

Hi:

If you are trying to restore a file from an Ignite recovery tape, then you need to skip the boot image at the tape's beginning:

For recovery tapes made on PA-RISC servers:

# mt -f /dev/rmt/0mn rew
# mt -f /dev/rmt/0mn fsf 1
# tar -xvf /dev/rmt/0mn ...

For recovery tapes made on Itanium servers:

# mt -f /dev/rmt/0mn rew
# mt -f /dev/rmt/0mn fsf 22
# tar -xvf /dev/rmt/0mn ...

Regards!

...JRF...

Re: tar ?

kunjuttan — Tue, 29 Dec 2009 11:38:48 GMT

"# mt -f /dev/rmt/0mn rew
# mt -f /dev/rmt/0mn fsf 1" - What is this for?

Re: tar ?

rariasn — Tue, 29 Dec 2009 11:40:09 GMT

Hi,

fsf Forward space count files.

Re: tar ?

kunjuttan — Tue, 29 Dec 2009 11:58:24 GMT

what it means and why they are using?

Re: tar ?

Pete Randall — Tue, 29 Dec 2009 12:07:49 GMT

They are two magnetic tape (mt) commands used to position an Ignite tape in order to be able to restore from it.

The first command (mt rew) rewinds the tape so you know you are at the beginning. The second command (mt fsf) Forward Spaces File(s) in order to skip over the boot header information on an Ignite tape so that you can restore individual files from it.

Pete