[Info-vax] Out of diskspace :(

[Johnny Billquist]

On 2012-05-19 07:13, Paul Sture wrote:
> On Sat, 19 May 2012 12:20:24 +0100, Single Stage to Orbit wrote:
>
>> On Sat, 2012-05-19 at 07:53 +0200, Martin Vorlaender wrote:
>>> Single Stage to Orbit wrote:
>>>> What is the largest size for disks that SimH-vax supports? Currently
>>>> these are 2GB SCSI disks. Is there anything else larger I can
>>>> configure SimH-vax with?
>>>
>>>     SET RQn RAUSER=s    ! set type to RA82 with size s MB
>>>
>>> If your SimH/VAX is compiled with large file support, the maximum size
>>> is 1 TB.
>>
>> Ah, excellent, I wasn't aware one could specify the disk size.
>>
>>> Use the SimH console to check whether large file support is compiled
>>> in:
>>>
>>>     sim>  show version
>>>     VAX simulator V3.8-1 [64b data, 64b addresses, Ethernet support]
>>
>> And that brings us to another problem; is it possible to 'grow' the disk
>> image or will I have to create the disk and copy the original disk into
>> the larger disk?
>
> I would advise against trying this.  In an attempt I made a couple of
> months ago I changed the existing disk to use RAUSER=n, with a much
> larger value for n than the original disk size, and a subsequent MOUNT
> command couldn't find the disk's home block.

Interesting. I would not expect that. However, "growing" the disk in 
place is not really going to work anyway. You need to re-initialize the 
file system for it to be able to use all of the disk anyway.

I would not expect VMS home blocks to be located on different blocks 
depending on the size of the disk. You learn something every day.

> According to PDF page 15 of vax780_doc.pdf (available from the trailing-
> edge site), RAUSER sets the disk type to RA82, so unless the original was
> an RA82 you are probably going to run into trouble.

Should not matter either. That's just a string that is shown. It should 
not make a difference from any code point of view.

> I would recommend creating a new disk with the desired capacity and using
> BACKUP to transfer existing data to it.

Yes.

	Johnny