Path: utzoo!attcan!uunet!wuarchive!julius.cs.uiuc.edu!apple!agate!shelby!morrow.stanford.edu!pangea.Stanford.EDU!karish
From: karish@pangea.Stanford.EDU (Chuck Karish)
Newsgroups: comp.unix.aix
Subject: Re: tape backup on RS/6000
Summary: /dev/rmt?.1
Message-ID: <1990Oct21.010948.3529@morrow.stanford.edu>
Date: 21 Oct 90 01:09:48 GMT
References: <1990Oct17.175518.18355@ux1.cso.uiuc.edu>
Sender: news@morrow.stanford.edu (UNIX News Service)
Organization: Mindcraft, Inc.
Lines: 27

In article <1990Oct17.175518.18355@ux1.cso.uiuc.edu> cfjph@mrcnext.cso.uiuc.edu
(Judy P. Halchin) writes:

>[H]ow do I backup all my filesystems onto a single tape.  After backing up each
>filesystem it rewinds the tape, forcing me to use a new one for the next
>filesystem.

Use /dev/rmt0.1 instead of /dev/rmt0 (your major number may vary) and
the tape will not rewind on close.  For more information, check the
info database.  It takes a bit of searching.

>Second, it warns me that a backup
>may not be any good if the filesystem was not unmounted first.  When I tried
>to unmount /usr I got a message that it was busy.  I think this is surely 
>because /usr/lib/sendmail and /usr/lib/errdemon were running.  sendmail poses
>no problem, but the man page for errdemon tells me not to stop and restart it.
>How then, am I to make a good backup of /usr?  What terrible things will 
>happen if I stop and restart errdemon?

Tell your users to log out, then do 'telinit 1'.  'telinit 2' will bring
the system back to normal multi-user mode.

To see how errdemon is started, try 'man inittab'.  I don't know why the
warning is there.
--

	Chuck Karish	karish@mindcraft.com