Long-term device utilization minor commands

Several long-term device utilization minor commands are available.

The names of the following minor commands of STAT all have the following form.

Figure 1. Format of long-term device utilization minor commands

Not all combinations are possible. For example, while there is a PDSK minor command to display all the DASD devices whose volsers match a certain pattern, there is no such thing as a PCTC command, because channel-to-channel adapters don’t have volsers.

See Figure 2 for an example of the display format of all these commands.

These commands display information about long-term device utilization.

Figure 2. Typical minor command of STAT display


STAT  Interval Start Time: 10:00:00     Elapsed:  7:17 MN    Length: 14:59 MN  
 pdsk  *         <-- Volser Pattern                                             
+       Number of Devices =     1389    Number of Samples =      438            
+     Volser LCU  Rate Utl% PAV   Resp = IOSQ + Pend + Conn + Disc RESV% #Alloc 
+3220 PP010P 046                    .3            .2     .1                40.0 
+3221 PP011P 046                    .5            .3     .2                     
+3222 PP012P 046                    .7            .4     .3                51.0 
+3223 PP013P 046                    .7            .4     .3                     
+3224 PP014P 046                    .5            .2     .2                 5.0 
+3225 PP020P 046                   1.0            .5     .4                     
+3226 PP030P 046    .1              .4            .2     .2                 4.0 
+3227 PP040P 046                    .6            .4     .2                 1.0 
+3228 PP050P 046   2.7   .1         .8            .2     .5                12.0 
+3229 PP060P 046                    .6            .4     .2                     
+322A PP061P 046                    .4            .3     .1                     
+322B PP062P 046                    .4            .3     .1                     
+322C PP070P 046   2.1   .2        1.3            .2    1.1                74.0

volser: Device volume serial number
LCU: Logical Control Unit
Rate: I/O rate (I/Os per second)
Util%: Device utilization in percent
PAV: Number of parallel access volumes
Resp: Average total device response time in milliseconds
IOSQ: Average I/O supervisor queueing time in milliseconds
Pend: Average pending time in milliseconds
Conn: Average connect time in milliseconds
Disc: Average disconnect time in milliseconds
RESV%: Percent of the time RESERVEd from this CPU
#Open: Average number of open data sets

An argument of P with STAT (STATP) displays the statistics in a graph:

Figure 3. Typical minor command of STATP display


 STATP Interval Start Time: 15:30:04 Elapsed:  8:04 MN    Length: 14:55 MN
 SDSK35 Number of Devices =      208    Number of Samples = 485
+       volser LCU  UTIL%      RESV%
+   350 DB2003 00A
+   351 TSO023 00A>
+   352 PROD06 00A
+   353 SYSA25 00A-->
+   354 PROD02 00A
+   355 TSO025 00A
+   356 OMON29 00A
+   357 MP220B 00A
+   358 PROD07 00A
+   359 COM007 00A
+   35A QM0002 00A
+   35B COM008 00A

This data pertains to the current RMF interval; the STAT command displays how long the intervals are, and how much of the current interval elapsed.