SUMMARY: Backup while in multi-user mode
Jon Allen Boone
jb3o+ at andrew.cmu.edu
Thu May 23 06:20:25 AEST 1991
Ok, so I'll take the advice that you ought to do level 0 dumps in
single-user mode.
Question:
Will the following scenario work?
2:00am (Dump Time!)
Cron on machine A (MA) says to do dumps.
Exebyte is on machine B (MB), so rsh the job to MB.
MB determines which filesystems need to be dumped at
what levels. Let's say that there are 10 different
file systems. Let's say that 1 needs a level 0 dump.
machine C (MC) needs the level 0 dump. Cron on MC
has a job scheduled which determines that it needs a
level 0 dump - so it shuts down. Then, it dumps the
level 0 filesystem, rsh'ing the output to a dd
command on MB. Once it's done, it reboots the
machine to multi-user mode.
Well? (Note: Comments about the insecurity of rsh,
etc. are welcome - but probably already known.)
If you can't do that, then WHAT can you do?
IF you have many different file systems - too many to actually go
around and hang a unique exebyte off of each one - and you can't
realistically change the location of the exebyte each night, what do
you do other than multi-user mode backups (some of which are level 0)?
Also, I just today did a multi-user backup/restore from one
machine to another - a level 0 dump of both / and /usr - restoring
each to another machine (with myself and another person logged in on
the dump machine) - and it seems to have worked just fine.
-=> iain <=-
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