cpio

[Edwin Ruiz_2]

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!

[Stephen Keane · Accepted solution]

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

to backup

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

to restore

[Sanjay_6]

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

[Edwin Ruiz_2]

thakns Stephen

[Stephen Keane]

Note that should be

cpio -icBvdmu < /dev/rmt/??

Not:

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


Bit of finger trouble there.

[A. Clay Stephenson]

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.