From:	SMTP%"RELAY-INFO-VAX@CRVAX.SRI.COM"  5-AUG-1994 14:24:57.95
To:	EVERHART
CC:	
Subj:	VD file setup

Date: Thu, 4 Aug 1994 19:23:13 -0400 (EDT)
From: EVERHART@arisia.gce.com
To: INFOVAX@arisia.gce.com
Message-Id: <940804192313.5b@arisia.gce.com>
Subject: VD file setup

When I create virtual disk containers on a new disk, I often like to
put them physically at the end of the disk and leave a "normal" fkile
oops, file area at the start.

For this I have the FILE utility and also the frag tool that comes
with juicer.

Basically, the operation is to initially create a single contiguous
file allocating the whole disk first.

1. Use FRAG to find the biggest contiguous disk area.
2. copy/contig/alloc=nnnnnn something.exe disk:[somewhere]file.dsk

Then for each file I want to create of M blocks, subtract M from
the file size by

$ set file/end disk:[somewhere]file.dsk

$file/end=(size-M) disk:[somewhere]file.dsk
$set file/trunc disk:[somewhere]file.dsk

Now I can copy another file of size M to fill in the end of the disk.

I use this method to keep allocating areas of disk in big chunks,
eventually deleting the original file.dsk file if I don't want the
start of the disk filled.

of course if you ONLY want virtual disks on a physical volume, the
/LBN and /LEN switches can be used and no host file system need
ever be specified. This can be done with no wasted space between.

In that case you use mou/for/sys on the host disk to get it to be
accessible. This can be done at boot.

Glenn
everhart@Arisia.gce.com