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HP OpenVMS Systems Documentation
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HP OpenVMS DCL Dictionary
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SHOW DEVICES/SERVED

Displays information on devices served by the mass storage control protocol (MSCP) server on this node. The /SERVED qualifier is required.

Format

SHOW DEVICES/SERVED

Description

The SHOW DEVICES/SERVED command displays information about the MSCP server and the devices it serves. This information is used mostly by system managers. The following message displays when the user issues a SHOW DEVICE/SERVED command when the tape server is not loaded: 


%SHOW-E-TMSCPNOTLD, TMSCP-Server code not loaded

Qualifiers

/ALL

This qualifier displays the information displayed by all of the qualifiers listed below except the /OUTPUT qualifier.

/COUNT

Displays the number of transfer operations completed, sorted by the size of the transfers, and the number of MSCP operations that have taken place since the MSCP server was started.

/EXACT

Use with the /PAGE=SAVE and /SEARCH qualifiers to specify a search string that must match the search string exactly and must be enclosed with quotation marks (" ").

If you specify the /EXACT qualifier without the /SEARCH qualifier, exact search mode is enabled when you set the search string with the Find (E1) key.

/HIGHLIGHT[=keyword]

Use with the /PAGE=SAVE and /SEARCH qualifiers to specify the type of highlighting you want when a search string is found. When a string is found, the entire line is highlighted. You can use the following keywords: BOLD, BLINK, REVERSE, and UNDERLINE. BOLD is the default highlighting.

/HOST

Displays the names of the processors that have MSCP served devices on line. The System Generation utility (SYSGEN) command MSCP/HOST determines how many hosts in the OpenVMS Cluster can connect to the MSCP server at one time.

/OUTPUT=[filespec]

Redirects output from your terminal to the specified file. If you do not specify a file, or if you do not use this qualifier, output is sent to SYS$OUTPUT.

/PAGE[=keyword]

/NOPAGE (default)

Controls the display of device information on the screen.

You can use the following keywords with the /PAGE qualifier:

CLEAR_SCREEN Clears the screen before each page is displayed.
SCROLL Displays information one line at a time.
SAVE[= n] Enables screen navigation of information, where n is the number of pages to store.

The /PAGE=SAVE qualifier allows you to navigate through screens of information. The /PAGE=SAVE qualifier stores up to 5 screens of up to 255 columns of information. When you use the /PAGE=SAVE qualifier, you can use the following keys to navigate through the information:

Key Sequence Description
Up arrow key, Ctrl/B Scroll up one line.
Down arrow key Scroll down one line.
Left arrow key Scroll left one column.
Right arrow key Scroll right one column.
Find (E1) Specify a string to find when the information is displayed.
Insert Here (E2) Scroll right one half screen.
Remove (E3) Scroll left one half screen.
Select (E4) Toggle 80/132 column mode.
Prev Screen (E5) Get the previous page of information.
Next Screen (E6), Return, Enter, Space Get the next page of information.
F10, Ctrl/Z Exit. (Some utilities define these differently.)
Help (F15) Display utility help text.
Do (F16) Toggle the display to oldest/newest page.
Ctrl/W Refresh the display.

The /PAGE qualifier is not compatible with the /OUTPUT qualifier.

/RESOURCE

Displays information about the resources available to the MSCP server for use in processing I/O requests for the devices it serves.

You make these resources available by using the following system parameters: MSCP_BUFFER, MSCP_CREDITS, MSCP_LOAD, and MSCP_SERVE_ALL.

See the HP OpenVMS Cluster Systems or SYSGEN online help for more information.

/SEARCH="string"

Use with the /PAGE=SAVE qualifier to specify a string that you want to find in the information being displayed. Quotation marks are required for the /SEARCH qualifier, if you include spaces in the text string.

You can also dynamically change the search string by pressing the Find key (E1) while the information is being displayed. Quotation marks are not required for a dynamic search.

Examples

#1 

$ SHOW DEVICES/SERVED
       MSCP-Served Devices on BIAK 28-MAY-2001 13:48:01.32 
 
                                             Queue Requests 
Device:           Status     Total Size     Current    Max    Hosts 
   $11$DUA8       Online        2376153           0      2        6 
   $11$DUA9        Avail        2376153           0      0        0 
   $11$DUA10      Online        2376153           0      2        8 
   $11$DUA11      Online        2376153           0      2        7 
   $11$DUA13      Online        2376153           0      2        7 
   $11$DUA14       Avail        2376153           0      0        0 
   $11$DUA16       Avail        2376153           0      0        0 
   $11$DUA17       Avail        2376153           0      0        0 
   $11$DUA18      Online        2376153           0      1        4 
   $11$DUA19      Online        2376153           0      4        7 
   $11$DUA20      Online        2376153           0      1        7 
   $11$DUA21      Online        2376153           0     17       12

This example shows the output generated by the command SHOW DEVICES/SERVED. The first column in the display shows the names of the devices that are served by the MSCP server. The second column shows the status of the devices. The third column shows the size, in blocks, of the device.

The Queue Requests columns show the number of I/O requests currently awaiting processing by that device and the maximum number of I/O requests that have ever been concurrently awaiting processing by that device. The last column in the display shows the number of hosts that have the device on line.

#2 

$ SHOW DEVICES/SERVED/COUNT
       MSCP-Served Devices on BIAK 28-MAY-2001 13:49:52.41 
  . 
  . 
  . 
Request Count: 
     0-7:   951154        32-39:     2168        88-103:     1618 
    8-15:   197224        40-55:     2543       104-127:      189 
   16-23:   137707        56-71:     8343 
   24-31:      982        72-87:      141 
 
Operations Count: 
   ABORT             0   ERASE          22772   READ        1042206 
   ACCESS            0   FLUSH              0   REPLACE           0 
   AVAILABLE       611   GET COM STS        0   SET CTL CHR     176 
   CMP CTL DAT       0   GET UNT STS  4026024   SET UNT CHR    3630 
   CMP HST DAT       0   ONLINE           427   WRITE        259953 
   Total       5355799

This example shows the information displayed by the SHOW DEVICES/SERVED/COUNT command. The numbers to the left of the colon (:), separated by a hyphen (-), are the size, in pages, of the requests. The numbers to the right of the colon are the number of requests of that size that have been processed by the MSCP server.

The section of the display headed by the label Operations Count shows the number of times the MSCP server has performed the MSCP operations listed. In the example, this MSCP server has performed 176 set-controller-characteristics (SET CTL CHR) operations, and has performed 3630 set-unit-characteristics (SET UNT CHR) operations.

#3 

$ SHOW DEVICES/SERVED/RESOURCE
       MSCP-Served Devices on BIAK 28-MAY-2001 13:51:32.01 
  . 
  . 
  . 
Resources:         Total      Free      In Use 
    Buffer Area:     400       400           0 
    I/O Packets:       0         0 
 
                 Current   Maximum 
    Buffer Wait:       0         0

This example shows the information displayed by the SHOW DEVICES/SERVED/RESOURCE command. The Total column shows the total number of pages in the buffer area and in the number of I/O-request packets set aside for use by the MSCP server. The Free column shows the number of pages in the buffer and the number of I/O-request packets that are available for use.

The In Use column shows the number of pages within the buffer area that are in use.

The line labeled Buffer Wait shows the number of I/O requests that are currently waiting for buffer space to become available for their use, and the maximum number of I/O requests that have waited concurrently to obtain a buffer.

#4 

$ SHOW DEVICES/SERVED/HOST
       MSCP-Served Devices on BIAK 28-NOV-2001 13:54:41.99 
  . 
  . 
  . 
                                           Queue Requests 
Host:              Time of Connection      Current    Max   Devices 
    IPL31       25-MAY-2001 21:44:06.44          0      1         0 
    DELAND      25-MAY-2001 21:44:09.98          0      1         0 
    HEAVEN      25-MAY-2001 22:03:15.67          0      7        10 
    VIVA        26-MAY-2001 09:44:11.96          0      1         0 
  . 
  . 
  .

This example shows the information displayed by the SHOW DEVICES/SERVED/HOST command. The first column contains the names of the hosts that have class drivers connected to the MSCP server. The next column contains the times at which these connections were made.

The columns under the heading Queue Requests show the number of requests the MSCP server currently has outstanding for I/O activity on the devices it serves, the maximum number of such requests that have been outstanding at one time, and the number of MSCP server devices that the listed hosts have on line.

#5 

$ SHOW DEVICES/SERVED
       MSCP-Served Devices on HEN  3-DEC-2001 09:09:08.49 
                                         Queue Requests 
Device:          Status    Total Size    Current   Max  Hosts 
   254$DJB1       Avail             0          0     0      0 
   254$DUA2      Online       1216665          0     0      1 
   254$DUA4006    Avail             0          0     0      0 
                            
      TMSCP-Served Devices on HEN  3-DEC-2001 09:09:08.74 
                                         Queue Requests 
Device:          Status     Position     Current   Max  Hosts 
   90$MUA7        Avail             0          0     0      0 
   90$MUA8        Avail             0          0     0      0 
   90$MUA50      Online          3804          0     0      0

This example displays the output of the SHOW DEVICES/SERVED command from a node that has both MSCP server and TMSCP server devices. In the display, the third column for MSCP server disk devices shows the size of the disk device. The same column for TMSCP server device shows the location where each tape is currently positioned.

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