[Info-vax] Idiots Guide To Clustering

[Phillip Helbig---remove CLOTHES to reply]

In article <gpoji5$ksc$1 at pcls4.std.com>, moroney at world.std.spaamtrap.com
(Michael Moroney) writes: 

> H Vlems <hvlems at freenet.de> writes:
> 
> >Basically what happens is that a few parameters in sys
> >$system:modparams.dat are set correctly.
> >ALLOCLASS : each cluster member in a VAX NI cluster must have a unique
> >and non-zero value
> 
> ALLOCLASS does not need to be nonzero.  A zero ALLOCLASS will change
> how a member's disks are named in the cluster.  They will be node$ddnu
> rather than $m$ddnu.  It was the norm during the time when local area
> vaxclusters with many nonvoting satellites to have the satellites use
> alloclass 0.
> 
> You want ALLOCLASS nonzero for any node serving shared storage, but I
> don't remember if that's even necessary with port allocation classes
> for shared SCSI.

It is necessary for HBVS.  It has nothing to do with HBVS except that 
otherwise the disk name is too long to fit into the SCB.