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From: jjo@calmasd.GE.COM (Jay Olson)
Newsgroups: comp.os.vms
Subject: Re: SA Backup and page/swap files (was Re: AUTOGEN "feature")
Message-ID: <2288@calmasd.GE.COM>
Date: Wed, 17-Jun-87 11:59:26 EDT
Article-I.D.: calmasd.2288
Posted: Wed Jun 17 11:59:26 1987
Date-Received: Sun, 21-Jun-87 13:01:12 EDT
References: <357bebf7.8be4@apollo.uucp> <2818@blia.BLI.COM>
Reply-To: jjo@calmasd.UUCP (Jay Olson)
Organization: Calma Company, San Diego
Lines: 36

In article <2818@blia.BLI.COM> ted@blia.BLI.COM (Ted Marshall) writes:
>Stand-Alone Backup includes a cut-down version of the VMS kernal. Thus, it
>needs swap and paging files. Thus, if SAB is booted from a disk, it better
>have valid swap and page files (as you discovered).

Not quite. SYSBOOT tries to find PAGEFILE.SYS and SWAPFILE.SYS in
SYS$SYSTEM. If they aren't found, VMS can run just fine, assuming you
don't need to page against the paging file and don't swap (as is the
case when booting standalone BACKUP). However, if they are found, the
usual fragmentation checks are made.

>You can always boot SAB from the console medium. In cases where it is not
>suitable for paging (i.e. TK-50 on a micro-VAX), the unsupported RAM disk
>driver is included in the kit and so it swaps and pages to memory.

Sort of. Console standalone backup kits don't have page and swap files. In
the case of the TK50, SYSBOOT doesn't even bother to look for a page or
swap file.

>Note that this situation creates a nice little zapper: don't boot SAB from
>a disk that you are then going to restore over. If SAB has to page, it'll
>do it right over the restored data! (SAB may protect against restoring over
>its "system" disk, I don't know off hand.)

Actually, you overwrite BACKUP itself. In the standalone BACKUP environment,
there is no paging against the page file, but there is paging against the
image being executed.

>-- 
>Ted Marshall       ...!ucbvax!mtxinu!blia!ted <or> mtxinu!blia!ted@Berkeley.EDU
>Britton Lee, Inc., 14600 Winchester Blvd, Los Gatos, Ca 95030     (408)378-7000
>The opinions expressed above are those of the poster and not his employer.

			- Jay Olson, a consultant to GE Calma, San Diego, CA.
			...sdcsvax!calmasd!jjo
			jjo@calmasd.GE.COM