Component Report - Input/Output Processor (IOP) Utilizations

The Input/Output Processor (IOP) Utilizations section of the Component report shows the input/output processor (IOP) utilization for communications, direct access storage devices (DASDs), multifunction (DASD, communication, and local work stations). Consistent utilization, at or above the threshold value of the DASD IOP and multifunction IOP, will affect system performance and cause longer response times or less throughput.

See the utilization guidelines and thresholds in the Performance Tools book for a list of threshold values.

Example

Note: The total for the I/O processor utilization often times does not match the sum of the three columns (IOP Processor Util Comm, IOP Processor Util LWSC, and IOP Processor Util DASD). This mismatch is caused by the utilization of other small components, such as system time.

                                                          Component Report                                        10/02/03 17:12:15
                                                          IOP Utilizations                                                Page  345
                                               Perf data from 14:00 to 16:00 at 1 min
Member  . . . : Q275140000 Model/Serial  . : 890/10-3907F       
Main storage . . :   56.4  GB Started . . . . :  10/02/03 14:00:00
  Library . . : PTLIBV5R3  System name . . : ABSYSTEM            
Version/Release  :    5/ 3.0  Stopped . . . . :  10/02/03 16:00:00
Partition ID  : 003        Feature Code  . :7427-2498-7427      
Int Threshold  . :    .00 %
Virtual Processors:   4    Processor Units :   4.0
                        --- IOP Processor Util ---     DASD      -- KBytes Transmitted --    Available
IOP                     Total   Comm   LWSC   DASD    Ops/Sec       IOP          System       Storage     Util 2
--------------------    -----  -----  -----  -----  -----------  -----------  -----------   -----------   ------
CMB05         (2843)       .4     .0     .0     .0                        54            0    65,038,208      .0
CMB06         (2843)       .0     .0     .0     .0                        72            0    63,717,218      .0
CMB07         (2843)       .5     .2     .0     .1                       488            0    53,520,379      .0
CMB08         (2843)      3.2     .0     .0    1.9                     1,314            0    61,607,496      .0
CMB09         (2843)       .3     .0     .0     .1                       249            0    61,645,950      .0
CMB10         (2843)       .3     .2     .0     .0                     6,885          256    55,139,610      .0
CMB11         (2843)      1.9    1.6     .0     .0                   147,424            0    53,390,615      .0
IOP                          --  Resource name and model number for each communications, DASD,
                                 multifunction, and local work station IOP
IOP Processor Util Total     --  Total utilization for IOP
IOP Processor Util Comm      --  Utilization of IOP due to communications activity
IOP Processor Util LWSC      --  Utilization of IOP due to local work station activity
IOP Processor Util DASD      --  Utilization of IOP due to DASD activity
DASD Ops/Sec                 --  Disk operations per second
KBytes Transmitted IOP       --  Total Kbytes transmitted from an IOP to the system across the bus
KBytes Transmitted System    --  Total Kbytes transmitted to the IOP from the system across the bus
Available Storage            --  The average number of bytes of free local storage in the IOP
Util 2                       --  Utilization of co-processor