[Info-vax] simh - Special Compilation

[Bob Koehler]

In article <q5rc19-4i81.ln1 at news.sture.ch>, Paul Sture <paul at sture.ch> writes:
> 
> This reminds me of the dual port massbus arrangement I used back in V3.n 
> days to share disks between 2 systems.  I could access a given disk from 
> both systems to share data, and this is the config I ended up with:
> 
> Disk 1: mounted for write by system A, cache disabled
> Disk 1: mounted for read-only by system B, cache disabled
> 
> Disk 2: mounted for write by system B, cache disabled
> Disk 2: mounted for read-only by system A, cache disabled
> 

   I recall this.  Many releases after VMS 4.0, when few people still
   used MASSBUS, DEC added support for dual write access to MASSBUS
   disks in a LAN based VMScluster.

   We used dual-ported MASSBUS disks to share data between to
   DECSYSTEM-20, but under TOPS-20 it was one system at a time.
   Even then we had to not put too many files in a directory.  Even
   though they were running the same version of TOPS-20, or 2060 could
   handle bigger directory files than our 2050.