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Conference spezko::cluster

Title:	+ OpenVMS Clusters - The best clusters in the world! +
Notice:	This conference is COMPANY CONFIDENTIAL. See #1.3
Moderator:	PROXY::MOORE

Created:	Fri Aug 26 1988
Last Modified:	Fri Jun 06 1997
Last Successful Update:	Fri Jun 06 1997
Number of topics:	5320
Total number of notes:	23384

5262.0. "same unit number on disk" by HGOSPS::MASCOTTANG () Fri Mar 21 1997 02:30

   My customer buys two ALPHA 4100 systems and runs ALPHA VMS V6.2. His 
configuration is listed as follows:

        ---------+--------------------------+----------------
                 |                          |
                 |                          |
 +-------+  +-----+-----+            +-------+-----+    +-------+
 | disk2 +--+  NODE A   |            |   NODE B    +----| disk1 |
 +-------+  +----+------+            +------+------+    +-------+
                |                          |
                |       +---------+        |
                +-------|  HSZ40  |--------+
                        +---------+

My question is :

1) Can I have the same unit number on disk1 and disk2 ?
2) If yes, how can I do that ?

   Would anyone have this experience ? Any advcie should be appreciated.

T.R Title User Personal
Name Date Lines

5262.1 "SCSI as a VMScluster Storage Interconnect" TIMABS::FREPPEL Mosquito ergo summm... Fri Mar 21 1997 07:29 19

T.R	Title	User	Personal Name	Date	Lines
5262.1	"SCSI as a VMScluster Storage Interconnect"	TIMABS::FREPPEL	Mosquito ergo summm...	`Fri Mar 21 1997 07:29`	19
	What is the allocation class of the HSZ? Will both nodes be MSCP disk servers? Assume the HSZ has an allocation class of 1 (any nonzero value will do). Assume further that both nodes will be MSCP disk servers. Then both nodes must have their allocation class set to the same value as the HSZ, hence 1. The name for disks disk1 and disk2 will therefore be of the form $1$dkcu, where c is the controller letter (A, B etc.) and u is the unit number. In order to uniquely identify (served) disks throughout the cluster, their name must be unique. Therefore, if you want to have identical unit numbers you must have different controller letters. Also you may find useful information in the OpenVMS V6.2 New Features Manual, Chapter 7 "SCSI as a VMScluster Storage Interconnect". (The manual is available in TIMA [among others]). Raymond.
5262.2	Also being discussed over in VAXAXP::VMSNOTES 362.*	XDELTA::HOFFMAN	Steve, OpenVMS Engineering	`Fri Mar 21 1997 10:20`	0

    What is the allocation class of the HSZ?
    Will both nodes be MSCP disk servers?
    
    Assume the HSZ has an allocation class of 1 (any nonzero value will
    do). Assume further that both nodes will be MSCP disk servers.
    Then both nodes must have their allocation class set to the same value
    as the HSZ, hence 1. 
    The name for disks disk1 and disk2 will therefore be of the form
    $1$dkcu, where c is the controller letter (A, B etc.) and u is the unit
    number. 
    In order to uniquely identify (served) disks throughout the cluster,
    their name must be unique. Therefore, if you want to have identical 
    unit numbers you must have different controller letters.
    
    Also you may find useful information in the OpenVMS V6.2 New Features 
    Manual, Chapter 7 "SCSI as a VMScluster Storage Interconnect". (The
    manual is available in TIMA [among others]).
    
    Raymond.

5262.2 Also being discussed over in VAXAXP::VMSNOTES 362.* XDELTA::HOFFMAN Steve, OpenVMS Engineering Fri Mar 21 1997 10:20 0