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Conference ssdevo::hsj40_product

Title:HSJ30/40 Product Conference
Moderator:SSDEVO::EDMONDS
Created:Tue Jul 13 1993
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:1264
Total number of notes:4958

1207.0. "failover on shadow sets" by PTOVAX::PEARLMAN () Mon Feb 10 1997 18:12

    A customer running OpenVMS 5.5-2 is using host based shadowing across a
    mixed architecture cluster.  The disks are connected to HSJ's.
    For sake of discussion the shadow set has two members each connected 
    to two different controller shelves.  Each controller shelf is an HSJ40 
    pair.  When a controller fails, the customer notices the load being 
    moved to the other HSJ in the controller shelf but the shadow set is 
    broken.  If they do a $SHOW DEVICE DSA0: they see a shadow set with 
    only one member.  It needs to be rejoined manually and a copy must occur.
    
    The  belief is this should be transparent to the software.
    
    Is this normal behavior?
T.RTitleUserPersonal
Name
DateLines
1207.1Timeout problem?SSDEVO::RMCLEANMon Feb 10 1997 18:221
What is the timeout set to?
1207.2Specifically, what is VMS SYSGEN SHADOW_MBR_TMO?SSDEVO::JACKSONJim Jackson, HSJ40 RAID teamMon Feb 10 1997 20:450
1207.3120PTOVAX::PEARLMANTue Feb 11 1997 12:483
    
                   Current
    SHADOW_MBR_TMO  120
1207.4Same problemTOPTEN::AVERBACHThu Feb 13 1997 13:386
    
    	I also had the same situation occur last nite while running C_SWAP
    to replace a bad cache battery. Two shadow sets lost members and they
    had to be manually added back in. This customer is running vms 6.1 and 
    SHADOW_MBR_TMO is also set to 120.
    						Joe
1207.5hardware or software - any ideas?PTOVAX::PEARLMANSun Feb 16 1997 20:121
    
1207.6EVMS::MORONEYUHF ComputersThu Mar 06 1997 21:056
Look through the error log for the reason the shadow member being expelled.

I don't know what the failover time for the HSJ40 is, but SHADOW_MBR_TIMEOUT
must be longer than this time, else the member will be expelled.

-Mike