home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: comp.sys.hp
- Path: sparky!uunet!usc!rpi!usenet.coe.montana.edu!news.u.washington.edu!zeus!davidb
- From: davidb@zeus.ce.washington.edu (David W. Barts)
- Subject: Re: Backup to DAT over net
- Message-ID: <1992Jul28.002016.18653@u.washington.edu>
- Sender: news@u.washington.edu (USENET News System)
- Organization: University of Washington
- References: <1992Jul23.170942.11576@cs.nott.ac.uk> <1992Jul27.095125.2987@eye.com>
- Date: Tue, 28 Jul 1992 00:20:16 GMT
- Lines: 41
-
- In article <1992Jul27.095125.2987@eye.com>, paul@eye.com (Paul B. Booth) writes:
- > In article <1992Jul23.170942.11576@cs.nott.ac.uk> pczip@mips.Berkeley.EDU (Ivan Powis) writes:
- > >We recently installed several hp9000/700's which are all networked together
- > >along with a single DAT drive. One question we asked all suppliers, including
- > >hp , was "can you run a backup over the net?". They all said yes. However,
- > >having chosen hp, I now find its not so simple. Using fbackup and traversing
- > >nfs mounts to get at files on the remote systems (ie not having the DAT drive)
- > >isn't adequate, because the superuser protection applied by NFS stops me
- > >accessing remote files that don't have general access permission. So using
- > >NFS to get at the remote file sytems isn't the answer.
- > >
- > >How do you go about this? At the moment we're having to physically carry the DAT
- > >drive around from machine to machine. This surely isn't the way it has to be done
- > >is it?
- > >
- > >Ivan Powis
- >
- > At 9.0, rumor has it, hp-ux will update its NFS implementation to allow you
- > to permit root access on an nfs-mounted filesystem. [ instructions on how
- > to punch a gaping security hole in NFS edited ]
-
- That will work, but aside from security issues, you're still running
- find(1) on a remote filesystem. (Can you say "slow"? I knew you
- could.)
-
- It is far better to avoid using NFS entirely when doing a backup. At
- UW Civil Engineering, we simply use the rmt(1m) interface of Gnu tar
- (which we always run local to the files being backed up) to send the tar
- data stream to a remote tape. The backup script itself runs on the
- tape host and simply uses remsh(1) to invoke an appropriate gtar
- command on the node being backed up. I.e., the tape host executes
- a command like:
- remsh workstation gtar cblf 32 tapehost:/dev/tapename / /users
-
- Other advantages of Gnu tar are the price (free!), portability between
- different systems, and source code availability if you find a bug that
- needs fixing RIGHT NOW.
-
- --
- David Barts N5JRN UW Civil Engineering, FX-10
- davidb@ce.washington.edu Seattle, WA 98195
-