[Info-vax] question on HBVS and SHOW DEVICE

[Phillip Helbig---undress to reply]

Consider the output from SHOW DEVICE/FULL below.  Question: why does the 
"shadow set virtual unit" appear for one of the disks but not the other 
two?  (For what it's worth, all disks are physically identical.)

Does it appear if the disk (shadow member) in question does not have a 
direct connection to the node on which the command is issued?

Disk DSA510:, device type Generic SCSI disk, is online, mounted, file-oriented
    device, shareable, available to cluster, error logging is enabled, device
    supports bitmaps (bitmaps active).

    Error count                    0    Operations completed            2013860
    Owner process                 ""    Owner UIC                      [SYSTEM]
    Owner process ID        00000000    Dev Prot            S:RWPL,O:RWPL,G:R,W
    Reference count               30    Default buffer size                 512
    Total blocks            35565080    Sectors per track                   254
    Total cylinders             7001    Tracks per cylinder                  20
    Logical Volume Size     35565080    Expansion Size Limit         2147418112

    Volume label              "USER"    Relative volume number                0
    Cluster size                  16    Transaction count                    99
    Free blocks             11989504    Maximum files allowed           2092064
    Extend quantity                5    Mount count                           3
    Mount status              System    Cache name           "_DSA110:XQPCACHE"
    Extent cache size             64    Maximum blocks in extent cache  1198950
    File ID cache size            64    Blocks in extent cache             5104
    Quota cache size               0    Maximum buffers in FCP cache       3554
    Volume owner UIC           [1,1]    Vol Prot    S:RWCD,O:RWCD,G:RWCD,W:RWCD

  Volume Status:  ODS-2, subject to mount verification, write-back caching
      enabled.
  Volume is also mounted on LEEBIG, MINNIM.

Disk $110$DKB400:, device type DEC RZ2ED-LS, is online, member of shadow set
    DSA510:, served to cluster via MSCP Server, error logging is enabled.

    Error count                    2    Shadow member operation count   3462353
    Allocation class             110

Disk $150$DKB400:, device type DEC RZ2ED-LS, is online, member of shadow set
    DSA510:, shadow set virtual unit, error logging is enabled.

    Error count                    0    Shadow member operation count    615995
    Current preferred CPU Id       0    Fastpath                              1
    Host name               "LEEBIG"    Host type, avail Digital Personal WorkStation , yes
    Allocation class             150

Disk $170$DKB400:, device type DEC RZ2ED-LS, is online, member of shadow set
    DSA510:, shadow set virtual unit, error logging is enabled.

    Error count                    0    Shadow member operation count    618930
    Current preferred CPU Id       0    Fastpath                              1
    Host name               "MINNIM"    Host type, avail Digital Personal WorkStation , yes
    Allocation class             170