[Simh] Simh Digest, Vol 168, Issue 38

[Larry Baker]

We ran into this on a real VAX when we added a 20GB SCSI disk, as I recall.  Either VAX/VMS or the hardware (I think it was VAX/VMS) only looks at the low-order 24 bits of the disk size.  So, our 20GB disk was viewed as a 3+GB drive on the VAX.  Alpha/VMS has no problem handling larger drives.  I think I've used 100GB drives on an Alpha.  I know I have a 72GB and a 50GB drive on our Alpha now.

Larry Baker
US Geological Survey
650-329-5608
baker at usgs.gov



> On 25 Jan 2018, at 6:04:06 PM, simh-request at trailing-edge.com wrote:
> 
> Message: 3
> Date: Thu, 25 Jan 2018 18:01:41 -0800
> From: Zane Healy <healyzh at avanthar.com <mailto:healyzh at avanthar.com>>
> To: Dennis Boone <drb at msu.edu <mailto:drb at msu.edu>>
> Cc: simh <simh at trailing-edge.com <mailto:simh at trailing-edge.com>>
> Subject: Re: [Simh] VAX Tape Emulation?
> Message-ID: <FB0095E0-4EC6-46CA-AEEB-52EEE315239E at avanthar.com <mailto:FB0095E0-4EC6-46CA-AEEB-52EEE315239E at avanthar.com>>
> Content-Type: text/plain; charset=utf-8
> 
> 
>> On Jan 25, 2018, at 2:22 PM, Dennis Boone <drb at msu.edu <mailto:drb at msu.edu>> wrote:
>> 
>> If you're venturing into unix technology, it's possible to mount nfs
>> shares on the VMS machines.  Then you can use BACKUP to write save sets
>> onto the nfs share.  There seems to be some care needed with ADF
>> metadata.  Multinet seems to write this to a hidden file or
>> subdirectory; not sure what UCX/TCPIP do.
> 
> I actually looked into this option around 2008 (for the same Alpha).  If I remember correctly I ran into a problem on the VMS side of the file size limit (I have the same disk size now I had in 2008).  This can work, but you have to break larger disks up into chunks.  I’m hoping to avoid that, with the solution I’m looking at.
> 
> Zane

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