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Conference vaxaxp::alphanotes

Title:	Alpha Support Conference
Notice:	This is a new Alphanotes, please read note 2.2
Moderator:	VAXAXP::BERNARDO

Created:	Thu Jan 02 1997
Last Modified:	Fri Jun 06 1997
Last Successful Update:	Fri Jun 06 1997
Number of topics:	128
Total number of notes:	617

122.0. "DUAL HOST support?" by TKOV51::YAMASHIGE (DEC JAPAN) Mon Jun 02 1997 05:42

 Does AlphaServer support Dual-Host ? (not Cluster)
 I hear VAX supprts Dual-Host.

 AlphaServer2100_A  does mount disk1,disk2.
 When AlphaServer2100_A fails down, AlphaServer2100_B does mount disks.

 
   Alpha      SCSI	Alpha
   2100_A ---+----+-----2100_B
    |    disk1	 Disk2    |
   System		System
    Disk		Disk

T.R Title User Personal
Name Date Lines

122.1 VMScluster Provides Coordination Needed For Sharing XDELTA::HOFFMAN Steve, OpenVMS Engineering Mon Jun 02 1997 11:10 24

T.R	Title	User	Personal Name	Date	Lines
122.1	VMScluster Provides Coordination Needed For Sharing	XDELTA::HOFFMAN	Steve, OpenVMS Engineering	`Mon Jun 02 1997 11:10`	24
	I am assuming this is an OpenVMS question. : Does AlphaServer support Dual-Host ? (not Cluster) : I hear VAX supprts Dual-Host. Neither platform supports unclustered dual-host. OpenVMS Alpha supports dual-host SCSI, when clustered. For shared SCSI, DSSI, CI or other shared interconnect VMScluster protocols, one must be configured in a VMScluster -- what your customer seeks to implement is called a partitioned VMScluster, and OpenVMS engineering has gone out of its way to prevent this particular configuration, and to thus prevent the massive corruptions -- both to disk and tapes, and to in-memory "live" data structures" -- that can arise (and have arisen) in this configuration. One can also see system crashes with these configurations -- I've seen both corruptions and crashes myself, and can not recommend this configuration. -- If OpenVMS, VAXAXP::VMSNOTES or SPEZKO::CLUSTER would be better spots. (This is the porting-to-Alpha, and the generic-Alpha notes conference.)

   I am assuming this is an OpenVMS question.

: Does AlphaServer support Dual-Host ? (not Cluster)
: I hear VAX supprts Dual-Host.

   Neither platform supports unclustered dual-host.

   OpenVMS Alpha supports dual-host SCSI, when clustered.
   
   For shared SCSI, DSSI, CI or other shared interconnect VMScluster
   protocols, one *must* be configured in a VMScluster -- what your
   customer seeks to implement is called a partitioned VMScluster, and
   OpenVMS engineering has gone out of its way to prevent this particular
   configuration, and to thus prevent the massive corruptions -- both to
   disk and tapes, and to in-memory "live" data structures" -- that can
   arise (and have arisen) in this configuration.  One can also see
   system crashes with these configurations -- I've seen both corruptions
   and crashes myself, and can *not* recommend this configuration.

   --

   If OpenVMS, VAXAXP::VMSNOTES or SPEZKO::CLUSTER would be better spots.
   (This is the porting-to-Alpha, and the generic-Alpha notes conference.)