[Info-vax] Valid disk types for SIMH?

[VAXman- at SendSpamHere.ORG]

In article <paul.nospam-BA3995.17084224112009 at pbook.sture.ch>, Paul Sture <paul.nospam at sture.ch> writes:
>In article <00832f91$0$1610$c3e8da3 at news.astraweb.com>,
> JF Mezei <jfmezei.spamnot at vaxination.ca> wrote:
>
>> Paul Sture wrote:
>> 
>> > Now you have me wondering if what I am seeing is a feature of the OS X 
>> > file system.
>> 
>> 
>> ls -l  provides the file size in terms of number of bytes used. Not sure
>> which incantation of ls s needed to get allocated blocks.
>
>ls -s gives the allocated blocks with a blocksize of 512. This can be 
>overridden by specifying a different size via the BLOCKSIZE environment 
>variable.
>
>ls -sk gives the number of allocated kilobytes, not blocks. This 
>overrides the environment variable BLOCKSIZE.
>
>
>> when you INIT, i believe that by default, it places some of the
>> structures in the middle of the disk.
>
>Thanks. That explains what I am seeing.
>
>> So the container file of say 1 gig would have some structure probably
>> written at the start and its middle, but nothing after. So the file
>> system would think the logical end of file is the highest byte written,
>> hence near the middle of the disk.
>
>A test with
>
>set -L rq3 rauser=100000
>
>$ INIT /INDEX=BEGINNING DUA3: DATA_3
>
>$ ls -s dua3.dsk
>1056 dua3.dsk
>$ ls -sk dua3.dsk
> 528 dua3.dsk
>
>$ INIT /INDEX=MIDDLE DUA3: DATA_3
>
>$ ls -s dua3.dsk
>51048 dua3.dsk
>$ ls -sk dua3.dsk
>25524 dua3.dsk
>
>$ INIT /INDEX= END DUA3: DATA_3
>
>$ ls -s dua3.dsk
>99992 dua3.dsk
>$ ls -sk dua3.dsk
>49996 dua3.dsk
>
>Not quite the full allocation, so:
>
>INIT /ERASE DUA3: DATA_3
>
>$ ls -s dua3.dsk
>100000 dua3.dsk
>$ ls -sk dua3.dsk
> 50000 dua3.dsk
>
>Oh, ls -skl also works:
>
>$ ls -skl dua3.dsk
> 50000 -rw-r--r--  1 simh  staff  51199488 Nov 24 16:54 dua3.dsk
>
>FWIW doing an INIT /ERASE on a 30GB disk took about 1 hour 10 minutes on 
>my 1.5 GHZ PowerBook. I might play with some FDL file placement to speed 
>things up here :-)

Faster might be to zap the file from the Mac's command line.

# dd if=/dev/zero of=/Users/PaulSture/dua3.dsk

(Or whatever the directory path of your dua3.dsk may be.)

Then, VMS INIT the disk.

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