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

tar backup and restore

DeafFrog — Thu, 18 Jun 2009 12:13:11 GMT

Dear Guru,
i googled for the any such previous thread
but was not able to find.here is a senario :

/dev/vg01/lvol3 10485760 29012 9803266 0% /var/mqsi
/dev/vg01/lvol1 26214400 56299 24523276 0% /var/mqm
/dev/vg01/lvol2 20971520 3193062 16667359 16% /var/mqm/log

i am doing -x inc_entire=vg00 in the ignite .
1)with the ignite tape , can i restore /var/mqm/log
since /var is in vg00 , ie mount mounts have been transversed
while taking the ignite backyp.

2)OR , If i backup the like this :
#tar cvf /dev/rmt/0m $(cat ~myhome/test1)
where test1 is :
#more test1
/var/mqsi
/var/mqm
/var/mqm/log
/usr/local/utilities
/xyz
/xyz1
/Logs
(I.e backing up absolute path)

will i able to do a complete restore of say /xyz,
#pwd
/
#tar xvf /dev/rmt/0mn /xyz
Is the understanding correct.

Re: tar backup and restore

James R. Ferguson — Thu, 18 Jun 2009 12:24:15 GMT

Hi:

You can restore your directory from your Ignite tape:

# mt -f /dev/rmt/0mn fsf 1
# tar -xvf /dev/rmt/0m var/mqsi var/mqm

Ignite used relative paths (a wise way to make any 'tar' archive!)

Regards!

...JRF...

Re: tar backup and restore

Michal Kapalka (mikap) — Thu, 18 Jun 2009 12:55:59 GMT

hi,

the best solution is to extract it from ignite tape ( advice from JRF ), and if you are use the tar command you should extract if without /. The slash will be ignored.

when i migrated some data i mounted it with NFS and use find + cpio, to move it to other location.

mikap

Re: tar backup and restore

DeafFrog — Thu, 18 Jun 2009 13:11:55 GMT

Hello James,

Thanks for prompt response.Is the second method of taking backup with absolute path correct considering i will need to restore every time exactly at same location.

Regards ,
Rahul

Re: tar backup and restore

V. Nyga — Thu, 18 Jun 2009 13:32:22 GMT

Hi,

this means you'll do an ignite tape of your os (vg00) and a tar tape for additionl things (vg01).

So you restore your server by
1. ignite for os
2. add tape for the additional things

This will work
Volkmar

Re: tar backup and restore

OldSchool — Thu, 18 Jun 2009 13:45:07 GMT

JRF said:

# mt -f /dev/rmt/0mn fsf 1
# tar -xvf /dev/rmt/0m var/mqsi var/mqm

Right, but the question was (and I have) is did Ignite catch the contents of those since they are in vg01, and only vg00 was included? or what Ignite does when building the list in this case.

I suppose a quick way to tell would be substitute "-tvf" for "-xvf" in the above.

Re: tar backup and restore

DeafFrog — Thu, 18 Jun 2009 13:46:33 GMT

Thanks Mikap and Volkmar,

Please let me know the correct method of restoration in second case i.e
tar cvf /dev/rmt/0m $(cat ~myhome/test1).
#pwd
/
#tar xvf /dev/rmt/0m var/mqm/log (if need to restore /var/mqm/log)
If need to restore a single file :
#tar xvf /dev/rmt/0m var/mqm/log/logfile1....Is that correct ..thanks a lot for all your help.

Re: tar backup and restore

DeafFrog — Thu, 18 Jun 2009 13:53:42 GMT

Dear Gurus,

I am done with day and will return after weekend.Thanks once again.
Regards,

Rahul

Re: tar backup and restore

James R. Ferguson — Thu, 18 Jun 2009 15:30:47 GMT

Hi (again):

An easy way to answer your question is for you to perform a test. That said:

> Please let me know the correct method of restoration in second case i.e
tar cvf /dev/rmt/0m $(cat ~myhome/test1).

> tar xvf /dev/rmt/0m var/mqm/log

This will not work, given that you created you archive with an absolute path. You must specify that for 'tar' to find the directory (or file) in the archive. Thus, do:

# tar -xvf /dev/rmt/0m /var/mqm/log

> If need to restore a single file :
> tar xvf /dev/rmt/0m var/mqm/log/logfile1

The same applies; you need:

# tar -xvf /dev/rmt/0m /var/mqm/log/logfile1

Regards!

...JRF...

Re: tar backup and restore

Dennis Handly — Fri, 19 Jun 2009 07:26:30 GMT

You may want to look into using pax(1) instead of tar. pax can read/write tar, cpio or pax extended.

Re: tar backup and restore

DeafFrog — Thu, 02 Jul 2009 09:26:52 GMT

If ignite is taken with -x inc_entire=vg00,the following can be restored, with ignite tape

/dev/vg01/lvol1 26214400 56299 24523276 0% /var/mqm, for the second case ,

i.s backup with absolute path , James is correct( as always !!)