Larry Baker
2018-01-26 02:17:24 UTC
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
Larry Baker
US Geological Survey
650-329-5608
Message: 3
Date: Thu, 25 Jan 2018 18:01:41 -0800
Subject: Re: [Simh] VAX Tape Emulation?
Content-Type: text/plain; charset=utf-8
Zane
Date: Thu, 25 Jan 2018 18:01:41 -0800
Subject: Re: [Simh] VAX Tape Emulation?
Content-Type: text/plain; charset=utf-8
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. Iâm hoping to avoid that, with the solution Iâm looking at.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.
Zane