Solved

tar remotely using ssh and directly transfer files into tape

Posted on 2001-08-24
9
905 Views
Last Modified: 2013-12-23
Hi,

I'm having trouble getting this to work. The local machine runs solaris and is the only one with a tape drive. i'm trying to archive files from other machines (running Linux) directly into the tape drive.

I tried commands like this:

Local> ssh user@remote "tar -cv /home/dir1" > /dev/rmt/0 dir1.tgz

and some combinations similarly but nothing gets into tape. It works if it is to a local directory though. I'll offer 200 points for this one, if anyone can help me out quickly.

Thanks,
KC
0
Comment
Question by:chenky
  • 3
  • 2
  • 2
  • +2
9 Comments
 
LVL 5

Expert Comment

by:ecw
ID: 6422641

$ ssh user@remote "tar -cf - /home/dir1" > /dev/rmt/0
0
 
LVL 40

Expert Comment

by:jlevie
ID: 6424238
The classic way to do this is to set the Solaris box up for rsh access for the appropriate users and to then do 'tar cf solaris-sys:/dev/rmt/0'. Of course there are security implications in doing that, but on a local LAN that is normally an acceptable compromise. For the really paranoid, having a 'tape only server' is an appropriate solution.
0
 

Author Comment

by:chenky
ID: 6427814
Thanks guys,

I tried those, seem to hangup - tape drive doesn't even blink, and it just seems to hang there.

KC
0
Flexible connectivity for any environment

The KE6900 series can extend and deploy computers with high definition displays across multiple stations in a variety of applications that suit any environment. Expand computer use to stations across multiple rooms with dynamic access.

 
LVL 38

Expert Comment

by:yuzh
ID: 6427903
Hi  chenky,

    In your LAN, set up rsh to use the remote tape. I assume that you know how to set this up. ( edit /etc/hosts, .rhosts file etc).

   to verify rsh: at the client box:
   rsh server echo test
   if you see test echo on your screen, it is ok with rsh, make sure that you have write permission to write to the tape drive on the server, if not, you might have to do it as root.

    use the following command to copy the files to the tape on the server:
(do this at your work station)

    tar cf - /home/dir | rsh tape-server dd of=/dev/rmt/0n

    you can verify what's on the tape at the workstation or tape server.

    make sure you rewind the tape first.

    Cheers!

===========
yuzh
 
   

   

   
0
 
LVL 51

Expert Comment

by:ahoffmann
ID: 6428005
>ssh user@remote "tar -cv /home/dir1" > /dev/rmt/0 dir1.tgz

What does  dir1.tgz  mean?

I suggest:
  ssh user@remote tar -cf - /home/dir1 | tar -xf /dev/rmt/0

(keep in mind that this device has a special block size, usualy, so the second tar probably should have an appropriate block size with the -b option)
0
 

Author Comment

by:chenky
ID: 6435812
Hi guys,

I prefer not to use rsh - security reasons - even on LAN. But thanks for the suggestions.

Hi ahoffmann,
Works better, but command line still hangs there without writing anything into tape. I've tried many other variations, including putting "" on "tar -cf - /home/dir1" as well as adding "-" after tar -xf. It should notify sending it to stdout and reading stdin within a created shell. Any ideas ?

Thanks,
Chenky
0
 
LVL 38

Accepted Solution

by:
yuzh earned 200 total points
ID: 6436120
Hi chenky,

   You can use ssh talk to the tape drive, but for some unknow reason, it cann't complete the tar process, that's
why you see the commanline hangs!

   May be you can try to use different blocking factors to see how it goes.

   use:ssh user@remote tar cfb 128 - /dirname | dd of=/dev/rmt/0n obs=128b

   
0
 
LVL 51

Expert Comment

by:ahoffmann
ID: 6438320
> tar cfb 128 -
should be
  tar cbf 128 -

chenky, could you pleas check if following produces a valid tar file:

    ssh user@remote tar -cf - /home/dir1|tar -xf /tmp/t.tar
0
 

Author Comment

by:chenky
ID: 6438978
Hi Yuzh,

very close, this actually works....
ssh user@remote "tar cf - /dirname"| dd of=/dev/rmt/0 obs=126b

anyway I accept yours as an answer, Thank you and also the other guys too, saved me from a lot more headache.(been having lots!)

200 points is yours!

Thanks again,
Chenky
0

Featured Post

Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Data center, now-a-days, is referred as the home of all the advanced technologies. In-fact, most of the businesses are now establishing their entire organizational structure around the IT capabilities.
Join Greg Farro and Ethan Banks from Packet Pushers (http://packetpushers.net/podcast/podcasts/pq-show-93-smart-network-monitoring-paessler-sponsored/) and Greg Ross from Paessler (https://www.paessler.com/prtg) for a discussion about smart network …
Viewers will learn how to connect to a wireless network using the network security key. They will also learn how to access the IP address and DNS server for connections that must be done manually. After setting up a router, find the network security…
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…

821 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question