Automated Dumps
Marc Ph. A. J. St.-Gil
mstgil at sol.acs.unt.edu
Mon Apr 29 05:20:00 AEST 1991
stubblef at stl-08sima.army.mil (Glenda Stubblefield) writes:
>I need to develop the means to
>do automatic backups, both full and incrementals, through cron during off
>hours.
I am doing such a thing. We have 1.7GB of local disk and a 2GB 8mm tape
drive. We do the incrementals like you do. On Friday nights we do
unattended SABs. Here's the scenario:
1. at 1700 Fri. - cron fires off a shutdown -r timed for 0200 Sat.
2. at 0130 Sat. - cron 'touches' a file called .../do_backup
3. at 0200 Sat. - the reboot occurs
4. at 0200+ Sat. - the rc.boot script checks for the .../do_backup file
If it is there, it fires off a the SAB script and finishes re-booting
when the script terminates.
5. at about 0300 Sat. - the backup finishes and the system comes the rest of
the way up.
The only problem I have encountered is that the system can hang waiting
for a dead backup if there is no tape in the drive. Therefore, check for
the tape being present at the begining of the SAB script.
Marc St.-Gil, UNIX Systems Administrator mstgil@{sol,vaxa,vaxb}.acs.unt.edu
University of North Texas 817/565-2324 mstgil@{ponder,solo}.csci.unt.edu
Academic Computing Services DISCLAIMER: My employers had no idea I was
PO Box 13495, Denton TX, 76203 going to say that.
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