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

tar restore

Eric Zumwalt_1 — Wed, 23 Jun 2004 13:01:45 GMT

Hi,

I'm trying to restore the /usr directory from tape using tar but I want to restore it to a different directory. Could someone tell me the command to extract the /usr directory from tape to my /dumps directory.

Thanks,

Eric

Re: tar restore

Patrick Wallek — Wed, 23 Jun 2004 13:04:35 GMT

It depends on how it was backed up.

If it was done like:

# tar -cvf /dev/rmt/?mn /usr

Then you'll need to use pax and do some name substitution to do what you want. 'man pax' for more information.

If it was done like:

# tar -cvf /dev/rmt/?mn ./usr
or
# tar -cvf /dev/rmt/?mn usr

Then just do:

# cd /dumps
# tar -xvf /dev/rmt/?mn usr
or
# tar -xvf /dev/rmt/?mn ./usr

Re: tar restore

RAC_1 — Wed, 23 Jun 2004 13:04:59 GMT

The tar backup taken with absolute names would be difficult to restore to some ther path.

GNU tar can take care of this. Get gnu tar and check if you can do that.

The crude method would be as follows.

cd /dumps

pax -rv -s '/^\///' < /dev/rmt/0m

Anil

Re: tar restore

Sundar_7 — Wed, 23 Jun 2004 13:07:03 GMT

Hi Eric,

PAX is the way to go.

# mt -f /dev/rmt/0mn fsf 1

# cd /mnt

# pax -rvf /dev/rmt/0mn -s '|^\/|\./|'

Sundar

Re: tar restore

Eric Zumwalt_1 — Wed, 23 Jun 2004 13:10:41 GMT

what I did was,

cd /dumps
tar -xvf /dev/rmt/0m

My screen showed it extracting but when I looked in the /dumps directory I didn't see anything so I killed the process.

It was tar'd by this command

tar -cvf /dev/rmt/0m /usr

Re: tar restore

RAC_1 — Wed, 23 Jun 2004 13:11:26 GMT

I missed this step in my posting.

mt -f /dev/rmt/0mn fsf 1

No points for this please.

Anil

Re: tar restore

Patrick Wallek — Wed, 23 Jun 2004 13:12:05 GMT

You'll HAVE to use either pax or GNU Tar in this case.

Re: tar restore

Sundar_7 — Wed, 23 Jun 2004 13:12:21 GMT

oops ! sorry, I assumed it is a ignite-ux recovery tape. Please skip the mt command.

Re: tar restore

Patrick Wallek — Wed, 23 Jun 2004 13:13:07 GMT

By the way, I hope this is a development machine or this was a VERY Recent backup tape as you just overwrote part of your /usr stuff. Hopefully you won't suffer any ill effects from this.

Re: tar restore

Eric Zumwalt_1 — Wed, 23 Jun 2004 13:20:56 GMT

so even though I was in the /dumps directory when extracting the data it was really extracting into my current /usr directory?

Re: tar restore

RAC_1 — Wed, 23 Jun 2004 13:22:57 GMT

That is because, you had taken backup with absolute path names.

You took it as tar -cvf /dev/rmt/0m /usr

You should have done tar -cvf /dev/rmt/0m ./usr OR usr

Anil

Re: tar restore

Sundar_7 — Wed, 23 Jun 2004 13:26:56 GMT

Hi Eric,

Yes, your tar command effectively extracted the contents to /usr file system.

With tar,if you create the archive with absolute path, tar -xvf will always restore the contents to the absolute path. You will have to use pax or GNU tar.

Here, since you created the archive using the absolute path (tar -cvf /dev/rmt/0m /usr), tar -xvf will always restore the files to /usr.

How recent was the archive ? What prompted the need for restoring /usr file system from the tape ? were there any signification changes to the system after the archive was created (like installation of sw/patches etc).

-- Sundar.

Re: tar restore

Eric Zumwalt_1 — Wed, 23 Jun 2004 13:37:23 GMT

Well we needed some data from a different company. They had it stored on there /usr directory. So when I tried to extract that /usr directory it looks like it overwrote some directories in my /usr directory. like the bin and sbin directories. So now I'm going to have restore those.

Re: tar restore

Eric Zumwalt_1 — Wed, 23 Jun 2004 13:51:14 GMT

Anyone know where the license file is located? What directory? I went from Unlimited user license to a two user license.