[Info-vax] Idiots Guide To Clustering

[Michael Moroney]

helbig at astro.multiCLOTHESvax.de (Phillip Helbig---remove CLOTHES to reply) writes:

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

>> 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.

Sort of.  The disk name in the SCB isn't text, but two longwords.  The
first is the alloclass as a binary integer, the second is the ddcu: in
a compressed format.  The first is an integer and doesn't accomodate
a 6 character name.  You can't simply stick alloclass 0 in there since
it's not unique (FOO$DKA0: and BAR$DKA0: are both alloclass 0 and would
have the same representation in this format, but are different drives on 
different systems)