topic Re: cpio in Operating System - HP-UX

cpio

Edwin Ruiz_2 — Wed, 12 Jan 2005 12:09:01 GMT

Hi!

I want to backup files to tape using cpio command. what is the sintaxis for this command for backup and restore???

Thanks for ur hlep!

Re: cpio

Stephen Keane — Wed, 12 Jan 2005 12:12:05 GMT

find (whatever) | cpio -ocBv > /dev/rmt/??

to backup

cpio -icBvdmu << /dev/rmt/??

to restore

Re: cpio

Sanjay_6 — Wed, 12 Jan 2005 12:14:29 GMT

Hi Edwin,

Take a look at this chapter,

http://docs.hp.com/en/B2355-90672/ch09.html

We do not use cpio now-a-days because of certain limitation on the size of files it can handle. On hp-ux fbackup/frecover is more often used than cpio at present.

Hope this helps.

Regds

Re: cpio

Edwin Ruiz_2 — Wed, 12 Jan 2005 12:15:40 GMT

thakns Stephen

Re: cpio

Stephen Keane — Wed, 12 Jan 2005 12:19:14 GMT

Note that should be

cpio -icBvdmu < /dev/rmt/??

Not:

cpio -icBvdmu << /dev/rmt/??

Bit of finger trouble there.

Re: cpio

A. Clay Stephenson — Wed, 12 Jan 2005 12:23:09 GMT

Depending upon the tape drive, you can often see huge performance gains by reblocking cpio via dd.

So to add this layer:

find (whatever) | cpio -ocBv | dd ibs=5k obs=200k of=/dev/rmt/??

to backup

dd if=/dev/rmt/?? ibs=200k obs=5k | cpio -icBvdmu

to restore

The 'B' cpio option specifies 5K blocking so leave those alone but play the the 200k blocking to get overall highest throughput. It should be an integral multiple of 5k.