dubois@rhesus.primate.wisc.edu (Paul DuBois) (07/25/87)
I intend to begin doing the incremental dumps on my system during
the wee hours of the night. (Vax 8200, Ultrix 1.2). Although I
don't expect much machine activity at 3 in the morning, the file
systems will still techically be active (no single-user/umount/reboot
sequence, in other words). What kinds of problems might I reasonably
expect, should I ever need to restore one of these dumps? Anything
serious? Or just minor inconsistencies? Or not even that?
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Paul DuBois UUCP: {allegra,ihnp4,seismo}!uwvax!rhesus!dubois |
ARPA: dubois@rhesus.primate.wisc.edu --+--
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"My help does not come from the hills" |
Psalm 121:1mitch@stride1.UUCP (Thomas P. Mitchell) (07/29/87)
In article <227@rhesus.primate.wisc.edu> dubois@rhesus.primate.wisc.edu (Paul DuBois) writes: >I intend to begin doing the incremental dumps on my system during >the wee hours of the night. (Vax 8200, Ultrix 1.2). Although I >don't expect much machine activity at 3 in the morning, ^^^^ Check to see what cron does in the wee hours. Then schedule your 'at' or 'crontab' dump command files to miss the late night rush hours On my system 3 and 4 are not good times to start a 'dump' but 3:30 or 4:30 would be fine. You should also let your users know so they can avoid that time for work they schedule. >serious? Or just minor inconsistencies? Or not even that? ^^^^^^ some Dump (there are more than one version out there) will commonly work on the raw device. First building a list of things to be backed up and their real location. Later it does the reads. If at the time of the reads something of value changed -- well it might be a real mess. Thomas P. Mitchell (mitch@stride1.Stride.COM) Phone: (702) 322-6868 TWX: 910-395-6073 MicroSage Computer Systems Inc. a Division of Stride Micro. Opinions expressed are probably mine.