topic data copy in Operating System - HP-UX

data copy

Elena Leontieva — Wed, 11 Jun 2003 16:45:31 GMT

Hi,

I need to copy a large volume (140 GB) nfs mounted on one hp-ux server to the newly created volume on XP256 that will be mounted on a different hp-ux server. We can export nfs volume to the second machine and do cp. What else could be done? Looking for the best timing solution with the least impact on the environment.
Elena.

Re: data copy

Pete Randall — Wed, 11 Jun 2003 16:48:49 GMT

Elena,

I would lean toward restoring a tape backup onto the new system.

Pete

Re: data copy

Paul Sperry — Wed, 11 Jun 2003 17:00:14 GMT

cd /oldvol

find . ???print | cpio ???pcxvdmu /newvol

is how I would do it.

Re: data copy

Chris Vail — Wed, 11 Jun 2003 17:03:18 GMT

if you do this routinely, the fastest way to do it is to have the two machines each with a dedicated NIC, then wire them together "back to back". Then you can NFS mount them across that connection rather than using the bandwidth of your regular LAN.

Chris

Re: data copy

Hai Nguyen_1 — Wed, 11 Jun 2003 17:08:53 GMT

Elena,

If the two servers are network linked, you can use rcp to copy data remotely.
Both rcp and nfs use remote procedure call (RPC) to transfer data.

Hai

Re: data copy

Helen French — Wed, 11 Jun 2003 17:10:30 GMT

I would take NFS as the last chance during these type of file transfers. I would do any of the following in the order:

1) ftp ( i think this the fastest one)
2) rcp
3) fbackup with remsh ( you can use compression if needed)
4) cpio with remsh
5) rdump or vxdump
6) tar backup with remsh
7) NFS

Re: data copy

Elena Leontieva — Wed, 11 Jun 2003 17:41:45 GMT

r- commands are disabled in our environment.

Elena.

Re: data copy

Paul Sperry — Wed, 11 Jun 2003 17:53:11 GMT

this would require .rhosts to be set up

cd /oldvol
find . -print | cpio -ocxa | remsh ???cd /newvol;cpio -icxvdmu???

Re: data copy

Caesar_3 — Wed, 11 Jun 2003 18:12:43 GMT

Hello Elena!

Do you have SSH? Than you could you with
s-commands and not r-commands!

The to of the fastest way to copy files
(a lot of files and a lot of space)
is to use the tar command with pipe to remote:
tar cf - | ssh "(cd ; tar xf -)"

or with the dump/restore (but you maybe don't have this tools, need to install):
dump -0 -f - | ssh "(cd ; restore -f -)"

If you don't have any remote copy tools
you will need to export the voliume and use
nfs to copy but it's not the best way,
nfs has his problems.

If you have the SSH package installed
you can use the:
scp :
But the tar is the best for this actions,
a few months ago i made a check to find which
command is the fastest for copy files in the network and it's "tar".

The only problem that you can have is that
if you will have any problem on the way of the
copy you will start it again from the beginning
or to check what's coppied to much balagan.

But the first thing is that your network connection between them is fast and good!
That's will help you.

(140GB with good speed it's not much!)

Good luck!

Caesar