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HP OpenVMS Systemsask the wizard |
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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.
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