[Info-vax] Valid disk types for SIMH?

[VAXman- at SendSpamHere.ORG]

In article <00A95082.8F0DA36A at SendSpamHere.ORG>, VAXman-  @SendSpamHere.ORG writes:
>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

I forgot to mention to specify 'count' in the above.

-- 
VAXman- A Bored Certified VMS Kernel Mode Hacker    VAXman(at)TMESIS(dot)ORG

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