Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!mnetor!uunet!seismo!ut-sally!utah-cs!utah-gr!stride!stride1!mitch
From: mitch@stride1.UUCP (Thomas P. Mitchell)
Newsgroups: comp.unix.wizards
Subject: Re: Dumps on active file systems
Message-ID: <676@stride.Stride.COM>
Date: Tue, 28-Jul-87 19:09:35 EDT
Article-I.D.: stride.676
Posted: Tue Jul 28 19:09:35 1987
Date-Received: Thu, 30-Jul-87 04:49:34 EDT
References: <227@rhesus.primate.wisc.edu>
Sender: news@stride.Stride.COM
Reply-To: mitch@stride1.UUCP (Thomas P. Mitchell)
Organization: MicroSage Comp. Sys. Inc., 680 S. Rock Blvd, Reno, NV 89502
Lines: 23
Summary: Should check 'cron'

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.