Make a tar to a remote tape.

[Rui Vilao]

Greetings,

I have an HP-UX box connected to DLT drive.
I would like to store on tape the content of some directories of a remote HP-UX box via tar.

How can I achieve this?

Any help/suggestion is highly appreciated.

Thanks in advance for your help!

Kind Regards,

Rui.

[Pete Randall]

See Steve Steel's comments in this post:
http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0x6223eea29889d611abdb0090277a778c,00.html

Pete

[MANOJ SRIVASTAVA]

Rui


You cannot remote mount a tape drive , so either you can remote mount the fielsystem ( too slow ) or use stuff like fback which can access the remote tape drive .

Try using fbackup .

Manoj Srivastava

[Tom Danzig]

You could do something like:

/usr/bin/tar cvbf - ./ | remsh dd of=/dev/rmt/0m obs=32k"

Assumes /dev/rmt/0m is the correct tape device on the remote server. You will need to be able remsh to the other host. Add the source hostname to the appropriate user .rhosts file on the remote host to allow it.

[Brian M Rawlings]

Rui: check out the link Pete referenced, you will see that tar over LAN has subtle issues that discourage its use. Little things like undetectable data corruption can ruin your whole day.

I suggest fbackup (as most do for this function). Try the command line below and see if it works for you.

remsh "/usr/sbin/fbackup -f :/dev/rmt/ -i . -0 -v" > /tmp/fbackup.out 2>&1

The tape won't be in 'tar' format, but fbackup and frestore exist on each and every HP-UX system on which you might care to read the tape...

Regards, --bmr

[Rui Vilao]

Hi, Thanks to all.

I have tried on host2:

# tar cvf - /opt/nap2.1 | remsh host1 "cat - | dd of=/dev/rmt/2m bs=10k"

On host1:

# tar tvf /dev/rmt/2m
Tar: tape blocksize error

Looks the blocksize is wrong...
The DLT tape is ok, because it worked with local tars...

TIA,

Regards,


Rui.

[Sachin Patel]

Hi Rui,
I don't think you can read dd tape using tar.
you are writing tape using dd command and trying to read using tar.

use fbackup if you are going to read this tape on another hp system.

#fbackup -i /source_dir -f rem_system:/dev/rmt/1m

Thanks
Sachin

[harry d brown jr]

Get GNU tar:

http://hpux.connect.org.uk/hppd/hpux/Gnu/tar-1.13.25/


live free or die
harry

[Ted Ellis_2]

to read the tape, use the dd command in reverse:

dd if=/dev/rmt/2m bs=10k | tar -tvf -

should work just fine... I have used this before.

Ted

[Dr. Declan Forde]

Hi Rui
Harry D. Brown Jr. Suggested using GNU tar.
With gtar-1.12 this works fine using the following command where the -f file option is set to RemoteMachine:Raw_Device.

tar-1.12 -cvf zeus:/dev/rmt/0m files

You can even use the following for a particular user

tar-1.12 -cvf user1@zeus:/dev/rmt/0m files

The user needs to be able to remsh to the remote machine with the tape drive.

Note: Gnu tar 1.12 does not support files greater than 2GB :-(

GNU tar-1.13 does support large files >2GB :-) but unfortunately the remote part doesn't seem to work - I keep getting 'unknown host errors'
:-(

I suppose I'll have to download the latest gtar and give it a try.