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Getting Information About Devices on the System  



Use the DCL command SHOW DEVICES to retrieve information about devices on your system.

When you invoke the SHOW DEVICES command and do not specify a device or use a qualifier, the system displays information about all recognized devices.


NoteIf a device does not appear in the display, it is not recognized by the system. The device may not be connected, or the driver may not be loaded. For certain devices, you must manually connect them and load their device drivers. For more information, see Connecting Devices and Loading Device Drivers.

If you specify a device name with the SHOW DEVICE command, the system displays information about the device you specified. If you use certain qualifiers with SHOW DEVICES, information is displayed about those devices that currently have volumes mounted or that have been allocated to processes. Refer to the HP OpenVMS DCL Dictionary for a list of qualifiers that can be used with the SHOW DEVICES command.

The following examples use the SHOW DEVICES command. Device protection is RWPL (read, write, physical, logical).

The SHOW DEVICES/FULL examples include both volume protection and device protection. In addition, if a volume has a protected subsystem enabled, it also appears in the display.

Examples

  1. The following command shows all devices on the system:
    $ SHOW DEVICES
    
    Device                Device        Error   Volume         Free   Trans  Mnt
     Name                 Status        Count    Label        Blocks  Count  Cnt
    $11$DUA9:      (SNAP)  Online           0
    $11$DUA10:     (SNAP)  Mounted          2  PAGE             83643     3  26
    $11$DUA13:     (SNAP)  Mounted          0  WORK1           192297    36  26
    $11$DUA23:     (SNAP)  Online           0
    $11$DUA24:     (SNAP)  Mounted          0  MONITORPLUS     776808    86  26
    DAD0:         (TULIP)  Online           0
    DAD9:         (TULIP)  Online           0
    DAD44:        (TULIP)  Mounted wrtlck   0  CDBIN06JUL23     97947     1   1
    ROSE$MUA0:             Online           0
    LAVNDR$MUA0:           Online           0
    TULIP$MUA1:            Online           0
    IRIS$MUA1:             HostUnavailable  0
    OPA0:                  Online           0
    DBA0:                  Offline          0
    FTA0:                  Offline          0
    FTA239:                Online           0
    LTA0:                  Offline          0
    LTA3401:               Online spooled   0
    LTA3402:               Online spooled   0
    RTA0:                  Offline          0
    RTA1:                  Mounted          1
    RTA2:                  Mounted          0
    RTB0:                  Offline          0
    TXA0:                  Online           0
    TXA1:                  Online           0
    XT0:                   Offline          0
    
  2. The following command requests a full listing of the status of the DAD42: RRD40 device. The device is located on node IRIS in an OpenVMS Cluster environment.
    $ SHOW DEVICES/FULL DAD42:
    
    Disk DAD42: (IRIS), device type RRD40, is online, mounted, software write-
        locked, file-oriented device, shareable, error logging is enabled.
     
     Error count                    0   Operations completed                146
     Owner process                 ""   Owner UIC                      [SYSTEM]
     Owner process ID        00000000   Dev Prot    S:RWPL,O:RWPL,G:RWPL,W:RWPL
     Reference count                1   Default buffer size                 512
     Total blocks             1218000   Sectors per track                     4
     Total cylinders            50750   Tracks per cylinder                   6
     Allocation class              11
     
     Volume label      "CDBIN06JUL21"   Relative volume number                0
     Cluster size                   3   Transaction count                     1
     Free blocks                15153   Maximum files allowed            152083
     Extend quantity                5   Mount count                           1
     Mount status              System   Cache name        "_$11$DUA21:XQPCACHE" 
     Extent cache size             64   Maximum blocks in extent cache     1515
     File ID cache size            64   Blocks currently in extent cache      0
     Quota cache size               0   Maximum buffers in FCP cache       1330
    Volume status:  ODS-2, subject to mount verification, file high-water 
      marking, write-through caching enabled.
    
  3. The following command requests a full informational display about each DG device. This display shows only the first two devices: the mounted $1$DGA5001: device and the unmounted $1$DGA5004: device.
    $ SHOW DEVICES/FULL DG
    Disk $1$DGA5001: (CEAGLE), device type HSV110, is online, mounted, file-oriented
    device, shareable, device has multiple I/O paths, served to cluster via MSCP
        Server, error logging is enabled.
     
        Error count                    0    Operations completed               5773
        Owner process                 ""    Owner UIC                      [SYSTEM]
        Owner process ID        00000000    Dev Prot            S:RWPL,O:RWPL,G:R,W
        Reference count                1    Default buffer size                 512
        Current preferred CPU Id       0    Fastpath                              1
        WWID   01000010:6005-08B4-0001-42DC-0001-F000-0111-0000
        Total blocks            20971520    Sectors per track                   128
        Total cylinders             1280    Tracks per cylinder                 128
        Host name               "CEAGLE"    Host type, avail  AlphaServer ES40, yes
        Alternate host name      "CLETA"    Alt. type, avail  AlphaServer ES40, yes
        Allocation class               1
     
        Volume label              "5001"    Relative volume number                0
        Cluster size                  21    Transaction count                     1
        Free blocks             19598208    Maximum files allowed            476625
        Extend quantity                5    Mount count                           9
        Mount status              System    Cache name       "_$1$DGA3105:XQPCACHE"
        Extent cache size             64    Maximum blocks in extent cache  1959820
        File ID cache size            64    Blocks in extent cache                0
        Quota cache size               0    Maximum buffers in FCP cache       3444
        Volume owner UIC        [SYSTEM]    Vol Prot    S:RWCD,O:RWCD,G:RWCD,W:RWCD
     
      Volume Status:  ODS-2, subject to mount verification, file high-water marking,
          write-back caching enabled.
      Volume is also mounted on VMSROC, PAVER, VMSROL, CLETA, VMSJO, VMSMO, NOME,
              FARKLE.
     
      I/O paths to device              5
      Path PGA0.5000-1FE1-0015-22AC (CEAGLE), primary path.
        Error count                    0    Operations completed                  0
      Path PGA0.5000-1FE1-0015-22A9 (CEAGLE).
        Error count                    0    Operations completed                  0
      Path PGB0.5000-1FE1-0015-22A8 (CEAGLE).
        Error count                    0    Operations completed                  0
      Path PGB0.5000-1FE1-0015-22AD (CEAGLE), current path.
        Error count                    0    Operations completed               5773
      Path MSCP  (CLETA).
        Error count                    0    Operations completed                  0
     
    Disk $1$DGA5004: (CEAGLE), device type HSV110, is online, file-oriented device,
        shareable, device has multiple I/O paths, served to cluster via MSCP Server,
        error logging is enabled.
     
        Error count                    0    Operations completed                  0
        Owner process                 ""    Owner UIC                      [SYSTEM]
        Owner process ID        00000000    Dev Prot            S:RWPL,O:RWPL,G:R,W
        Reference count                0    Default buffer size                 512
        Current preferred CPU Id       0    Fastpath                              1
        WWID   01000010:6005-08B4-0001-42DC-0001-F000-0120-0000
        Host name               "CEAGLE"    Host type, avail  AlphaServer ES40, yes
        Alternate host name      "CLETA"    Alt. type, avail  AlphaServer ES40, yes
        Allocation class               1
     
      I/O paths to device              5
      Path PGA0.5000-1FE1-0015-22AC (CEAGLE), primary path.
        Error count                    0    Operations completed                  0
      Path PGA0.5000-1FE1-0015-22A9 (CEAGLE).
        Error count                    0    Operations completed                  0
      Path PGB0.5000-1FE1-0015-22A8 (CEAGLE), current path.
        Error count                    0    Operations completed                  0
      Path PGB0.5000-1FE1-0015-22AD (CEAGLE).
        Error count                    0    Operations completed                  0
      Path MSCP  (CLETA).
        Error count                    0    Operations completed                  0

Determining If Volumes Need Rebuilding  

If a volume was improperly dismounted, it may require rebuilding. Volumes are improperly dismounted when, for example, the system crashes. Use the /REBUILD_STATUS qualifier with the SHOW DEVICES command to determine if a volume needs rebuilding. Do not use the /REBUILD_STATUS qualifier with any other SHOW DEVICES qualifiers, except the /OUTPUT qualifier.

For each volume, SHOW DEVICES/REBUILD_STATUS returns one of the following values:

Value Meaning
Yes
Rebuild needed
No
Rebuild not needed
Not applicable
The volume cannot be rebuilt; the volume is not a disk or the volume is write-locked
Information unavailable
Rebuild information is not available; the volume is not mounted or mount verification is taking place

Do either of the following steps to rebuild a volume:

Device EMUL$DKB500, in the following example, needs rebuilding.

$ SHOW DEVICES/REBUILD_STATUS

Device Name             Rebuild needed?
 
ADU15$DKA300:           Information unavailable
EDIV$DKA300:            Information unavailable
EMUL$DKB200:            No
EMUL$DKB300:            No
EMUL$DKB500:            Yes
FTA0:                   Not applicable
OPA0:                   Not applicable

Getting Information About ISO 9660-Formatted Devices  

You can use the SHOW DEVICE command to retrieve information about ISO 9660-formatted devices. The following example illustrates the use of the SHOW DEVICES/FULL command to obtain information about an ISO 9660-formatted CD-ROM. Note that the ACP process name is given and that the volume status is listed as ISO 9660. The display tells the user that the mounted members of the volume set are relative volume numbers (RVN) 1, 64, and 65535.

$ SHOW DEVICE DKA1/FULL
Disk $1$DKA1: (VMSRMS), device type RRD40, is online, allocated,
    deallocate on dismount, mounted, software write-locked, file-oriented
    device, shareable, served to cluster via MSCP Server.
 
    Error count                    0    Operations completed                  9
    Owner process           "_FTA5:"    Owner UIC                    [FIN,USER]
    Owner process ID        20200066    Dev Prot            S:RWPL,O:RWPL,G:R,W
    Reference count                2    Default buffer size                 512
    Total blocks                 256    Sectors per track                    32
    Total cylinders                1    Tracks per cylinder                   8
    Allocation class               1
 
    Volume label          "VOLUME_1"    Relative volume number                1
    Cluster size                   0    Transaction count                     1
    Free blocks                    0    Maximum files allowed                 0
    Extend quantity                0    Mount count                           1
    Mount status             Process    ACP process name             "DKA1CACP"  
  Volume status:  ISO 9660.
  Members of this volume set are $1$DKA1: (rvn 1), $1$DKA7: (rvn 64), $1$DKA16:
          (rvn 65535).

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