HP OpenVMS Systems

Quad-enclosure DSSI with KFDDA?

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The Question is:

 
 Hello
 
I would like to know how to build a three node cluster with three VAX 4000
 Model 108 under VMS 5.5-2h4.
So the question could be : is the KFDDA-BB able to be daisy chain ? and what
 part number do I need to do this ?
(Step 3-storage of the QuickSpec says that)
Single system support two system DSSI VMS Cluster
Does that means that I can build a three node DSSI cluster
 
 
 
                 +---------------+
                 ! Vax 4000 M108 !
                 !               !
                 !         KFDDA +--+
                 !               !  !
              +--+ KFDDA         !  !
              !  +---------------+  !
              !                     + HSD50 + Disks
              !  +---------------+  !
              !  ! Vax 4000 M108 !  !
              !  !               !  !
              !  !         KFDDA +--+
              +--+ KFDDA         !  !
              !  +---------------+  !
disks + HSD50 +                     !
              !  +---------------+  !
              !  ! Vax 4000 M108 !  !
              !  !               !  !
              !  !         KFDDA +--+
              +--+ KFDDA         !
                 +---------------+
 
thanks for an answer.
 
 
 
 

The Answer is :

 
  The OpenVMS Wizard cannot recommend that a storage configuration this
  old be used -- your OpenVMS VAX version is a decade old, and the DSSI
  storage hardware is likely equivalently ancient.
 
  The KFDDA-A (dual DSSI) and KFDDA-B (single-bus) controller can be
  configured as a middle node on a DSSI bus.  Each end of the DSSI bus
  must be terminated; do not allow any intervening DSSI controller(s)
  to terminate the DSSI bus.
 
  This particular configuration is known as a four-enclosure or quad
  configuration.  So long as you have these four enclosures, you should
  be within the DSSI cabling limits assuming uniform use of nine-foot
  or shorter DSSI cables throughout.  You will need to establish unique
  DSSI unit numbers for each controller and each device on a DSSI bus.
 
  All DSSI hardware availability was retired many years ago.
 
  The OpenVMS FAQ has related information on DSSI configurations.
 

  

     

     
answer written or last revised on ( 9-DEC-2002 )
     
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