[Simh] Recovering VMS Savesets from .tap files

[Robert Jarratt]

Many thanks for the tips. Since posting I have remembered that I had some
code which I modified to do the extraction I needed onto the PC. I then
FTP'd the file to the VAX, set the attributes and hey presto, there was my
backup saveset. Still, I was not aware of the techniques you mention and it
is a very useful reference which I will keep.

 

Regards

 

Rob

 

From: Larry Baker [mailto:baker at usgs.gov] 
Sent: 06 April 2009 07:03
To: robert.jarratt at ntlworld.com
Cc: simh at trailing-edge.com; Larry Baker
Subject: Re: [Simh] Recovering VMS Savesets from .tap files

 

Rob,

 

I think there is a way to do what you want without network support on your
SIMH VAX.

 

I assume you can read your .tap file on a SIMH VAX/VMS system.  Backup save
sets on mag tape use ANSI labeled tape format, which is supported by
standard VMS DCL MOUNT, COPY operations -- you don't have to use Backup to
read back the tape on to disk.

 

MOUNT your .tap mag tape (/OVERRIDE=IDENT if you don't know the volume
name).  Do NOT use MOUNT /FOREIGN.

 

COPY *.* from the mag tape to a disk directory.  (If there are multiple save
set files on the tape, repeat the following steps for each one.)

 

Find out how many disk blocks the save set file uses from the DCL
DIRECTORY/FULL command.  (You want the no. of blocks used, not the number
allocated.)

 

Shutdown the SIMH VAX and connect a spare RQ device to a SIMH disk container
file that is exactly the same number of blocks.  For example, SET -L RQ2
RAUSER=4000, ATTACH RQ2 SAVESET.BCK, for a 4000 block save set file.

 

Reboot your SIMH VAX.

 

MOUNT/FOREIGN RQ2: and COPY the save set file to RQ2:.

 

Shut down the SIMH VAX.

 

Transfer the SIMH disk container file to your real VMS system in block mode,
like an .EXE or PDF file.

 

On your real VMS system, use the SET FILE /ATTRIBUTES command to fix the
file attributes of the file to match the file attributes from the
DIRECTORY/FULL command.

 

With luck, you'll have your Backup save set on your real VMS system intact.
BACKUP/LIST saveset/SAVE will list the contents.

 

Larry Baker

US Geological Survey

650-329-5608

baker at usgs.gov

 





 

On Apr 4, 2009, at 9:00 AM, simh-request at trailing-edge.com wrote:





----------------------------------------------------------------------

 

Message: 1

Date: Sat, 4 Apr 2009 10:57:57 +0100

From: "Robert Jarratt" <robert.jarratt at ntlworld.com>

Subject: [Simh] Recovering VMS Savesets from .tap files

To: <simh at trailing-edge.com>

Message-ID: <001501c9b50b$d6052960$820f7c20$@jarratt at ntlworld.com>

Content-Type: text/plain; charset="us-ascii"

 

I have a .tap file that contains VMS BACKUP savesets. I need to get these

savesets onto a real VAX. Is there a way to do this from the real VAX

itself? I know I could use the simulated VAX to do this, but the problem is

then getting the file across to the real VAX. My last attempt to use TCP/IP

with SIMH was a disaster, the winpcap install trashed my machine and I am

wary of repeating the experience.

 

 

 

Thanks

 

 

 

Rob

 

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