MIO
This service provides workload (address space-related) information, which lets you detect jobs monopolizing specific devices and channel paths.
Syntax
The parameters are defined as follows:
Parameter | Description |
|---|---|
chpid | channel path identifier |
chpid1-chpid2 | range of channel path identifiers; chpid1 is the lowest channel path identifier, and chpid2 is the highest channel path identifier |
time | specifies the length of the sample period in seconds; the default sample period is 15 seconds, and the maximum period is 1,200 seconds |
Examples
To display information about all channel paths, enter:
MIO
AMTO31I Channel Path Utilization Report
[1] [2] [3]
AMTO32I CHANNEL PATH 00 (BYTE) WAS 5% BUSY
AMTO32I CHANNEL PATH 03 (BLOCK) WAS 23% BUSY
AMTO32I CHANNEL PATH 12 (BLOCK) WAS 45% BUSY
AMTO32I CHANNEL PATH 23 (BLOCK) WAS 17% BUS
AMTO33I Processor I/O Interrupt Activity Report
[4] [5] [6]
AMTO34I CPU 00 Processed 4,670 Interrupts ( 6% were through TPI)
AMTO35I Device and Logical Control Unit Report
[7] [8] [9] [10] [11] [12] [13] [14] [15] [16]
AMTO36D -----------------------------------------------------
AMTO36H Dev Volser %Bsy Qlth Seek ACYL Rate Conn Pend Disct DAO
AMTO36I 3500 3 0 0 0
AMTO38D ------------------
[17] [18] [19]
AMTO38H ASIDname ASID %Bsy
AMTO38I CONSOLE 000A 100
AMTO36D ---------------------------------------------------------
AMTO36H Dev Volser %Bsy Qlth Seek ACYL Rate Conn Pend Disct DAO
AMTO36I 858E USSA01 0 0 0 0 .20 0 0 0 0
AMTO38D ------------------
AMTO38H ASIDname ASID %Bsy
AMTO38I MV60DS36 014F 100
AMTO36D ----------------------------------------------------------
AMTO36H Dev Volser %Bsy Qlth Seek ACYL Rate Conn Pend DisctDAO
AMTO36I 8370 BAB327 7 0 2 1 25 4 .20 0 0
AMTO38D ------------------
AMTO38H ASIDname ASID %Bsy
AMTO38I AAONS73 012A 40
AMTO38I AAOD72B 00A6 60
Legend:
- channel path identifier (CHPID)
type of channel path as specified during IOCP generation
The valid path types are BLOCK, for block multiplexing paths, and BYTE, for byte multiplexing paths.
percentage of time that the channel path was busy during the sample period
- CPU identifier (CPUID) for the processor whose activity is being reported
- total number of I/O interrupts (including TPIs) processed by this CPU in the sample period
- percentage of I/O interrupts processed by this CPU that did not require a physical PSW swap (that is, were processed through the Test Pending Interrupt (TPI) instruction)
- device number whose activity was measured
- volume serial number of the device measured
- percentage of time that an I/O request was active for the device
- average number of I/O requests queued by the I/O supervisor for the device
- total number of head movements observed for the device during the sample period (N/A for non-DASD and fixed-head devices)
- average number of cylinders moved for each seek observed for the device
- number of I/O requests per second addressed to this device
- average time (in milliseconds) that the device was connected to a channel path on a per-request basis
- average time (in milliseconds) that each request was held, pending availability of a waiting for path, device, or control unit
- average time (in milliseconds) that the device was disconnected from the channel path pending a device or control unit function (seek) on a per-request basis
name of an address space found to be a significant user of the device
In this field, asterisks (*********) indicates that the address space terminated between the time that the data was collected and the time that the MDEVICE report was generated. The value *OTHERS* in this field indicates that the address space had more users during the sample period than could be listed. All activity for the overflow of users is reported as *OTHERS*.
- number of the address space found to be a significant user of the device
- percentage of the device busy time that this address space was requesting the device