3. REPORTS › 3.2 MICF Inquiries › 3.2.1 VM MICF Inquiry Descriptions › 3.2.1.2 VM Performance Analysis Inquiries › 3.2.1.2.1 Detail VMX Concurrent Channel Busy

3.2.1.2.1 Detail VMX Concurrent Channel Busy

This report produces a graph of concurrently busy channels
during a user-defined reporting period.  Each bar of the
graph represents the number of times during the reporting
period that n number of channels were concurrently busy,
where n represents the actual number of channels.

INTENDED USE:

   Allows analysis of whether the I/O workload is being
   spread over the channel subsystem.  This report might be
   used to identify periods of poor system performance due to
   the system's inability to use more than one or two
   channels at a time.

FORMAT:

   A horizontal bar chart of concurrent channel activity.
   Each bar represents the number of times during the
   reporting period that the channel subsystem was sampled,
   and the associated number of channels that were
   concurrently active.  Only non-zero states are shown.


   An example of this report is shown in Figure 3-13.

INQUIRY ID:

   Color Graphics:  VMXCX1
   Printer Graphics:  VMXPX1

DATA SOURCE (File/Timespan):

   VMXSGP01 - DETAIL

DATA ELEMENTS USED:

   SGPCBZxx - CHPIDs Simultaneously Busy

 CALCULATIONS:

   The information is summarized across the user specified
   time period, and a separate record is output for each non-
   zero value of SGPCBZxx.  Data element CHNSBUSY is created
   from the value of xx in SGPCBZxx, and element BUSYCNT
   contains the corresponding value of SGPCBZxx.

USAGE CONSIDERATIONS:

   The Channel Path Contention Data File (VMXCHC) is created
   from the 0/09 monitor records.  With the introduction of
   z990 processor, the 0/09 no longer contains valid channel
   path information.  It is recommended that the 0/18 or 0/20
   monitor records be used for valid channel path
   information.
 
   See report VMXLS1 (VM Channel Path Load Analysis).

                                                 Detail VMX Concurrent Channel Busy
                                                          ABC Corporation
 
 INQUIRY:  VMXPX1                                                                                              RUN DATE:  23JUNyy
 
------------------------------------------------------ SYSID=VM1 DATE=26MAYyy ------------------------------------------------------
 
   Number of Channels Concurrently Busy                                                                                Busy Count
                                                                                                                              Sum
              |
    0         |>>>>>                                                                                                           25
              |
    1         |>>>>>>>>>>>>>>>>>>>>>>>>>>                                                                                     128
              |
    2         |>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>                                                   302
              |
    3         |>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>                475
              |
    4         |>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>         511
              |
    5         |>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>                        435
              |
    6         |>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>                                                    297
              |
    7         |>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>                                                                               162
              |
    8         |>>>>>>>>>>>>>>>>>                                                                                               87
              |
    9         |>>>>>>                                                                                                          29
              |
   10         |>>>                                                                                                             14
              |
   11         |>                                                                                                                5
              |
   12         |                                                                                                                 2
              |
              ----+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+--
                  20  40  60  80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500
 
                                                             Busy Count

 Figure 3-13.  Detail VMX Concurrent Channel Busy