Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!know!samsung!uunet!mcsun!ukc!strath-cs!prlhp1!pearmana
From: pearmana@prlhp1.prl.philips.co.uk (Andy Pearman)
Newsgroups: comp.sys.hp
Subject: find and cpio
Keywords: dumping
Message-ID: <1150@prlhp1.prl.philips.co.uk>
Date: 11 Sep 90 14:47:23 GMT
Reply-To: pearmana@prlhp1.UUCP
Organization: Philips Research Laboratories, Redhill, UK
Lines: 30


I've been thinking about how our dumping works on our various
Unix based machines and I'm now a bit worried about our HP systems.

On our Suns we use dump/restore which works on inodes.  This means
that a file with several hard links will only be dumped once - no
problem then when restoring.

On HP-UX (6.21) we use  their backup script which effectively does:

  cd /
  find . -hidden -print | cpio -ocxa | tcio ......

Am I right in thinking that find works by looking in directories
and -print's everything it finds, which of course means that
several directory entires hard-linked to the same file will be
picked up individually and passed to cpio for dumping ?

When performing a restore using cpio I assume that each file read
is allocated a fresh inode and therefore what may have been
one file hard-linked several times will be restored as several
individual files (taking up more disk-space than originally used).

I would be grateful if someone could clear this up for me.

   Andy
-- 

Andy Pearman, Computer Dept, Philips Research Labs, Redhill, Surrey, England. 
              pearmana@prl.philips.co.uk