VMS and ULTRIX on the same CI?

[Bill Braden]

> I have a mixed-interconnect VAX cluster with 8800, 785, 6240 and
> VAXStation 3100s.  The disks are connect to the star coupler with
> two HSC 70-s, all dual-ported.  VMS version is 5.3-1.  A few tape
> drives, too.

I have not tried a CI cluster with VMS and ULTRIX but we did operate 
for some time with multiple VMS clusters on the same CI.  We found the 
hard way that disks could become corrupt just by mounting them on two
indpendent clusters at the same time.  It was not necessary for any 
transactions to occure on either system.

If I were going to attempt VMS and ULTRIX on the same CI, I think I 
would set the ULTRIX device /noavaliable on the VMS system and remove 
the device special files for the VMS disks from the ULTRIX system.

--Bill Braden	(Measurex Inc.)

					Onward Through the Fog!