This table is provided with the TDS Device Statistics component. It provides statistics on the I/O activity of MVS devices. The data comes from SMF type 74, subtype 1 records.
The following comprises a list of the attributes for this attribute group. The name in bold text shows how the attribute appears in the Tivoli Enterprise Portal.
Node The managed system name of the agent.
Timestamp The value is the time collected from the agent system when the data row was built and sent from the agent to the Tivoli Enterprise Monitoring Server (or stored for historical purposes). It represents the local time zone of the agent system.
Date Date of the mid measurement. From SMF74DAT, SMF74IST, and SMF74INT.
Time Time of the mid measurement. From SMF74DAT, SMF74IST, and SMF74INT.
Period Name Name of the period. This is derived using fields SMF74DAT, SMF74IST, and SMF74INT from the record as parameters in the PERIOD function.
MVS System ID MVS system ID. From SMF74SID.
Device Number Device number. From MVS_ADDR in the MVSPM_DEVICE_ADDR lookup table, or from SMF74NUM if no match is found in the lookup table.
Volume Serial Number Volume serial number.
Average Connect Time per Request Average connect time, in milliseconds per request. Calculated as CONNECT_MSEC/MEASUREMENT_EVENTS.
DASD mpl Average number of users waiting for the device. Calculated as ((CONNECT_MSEC+DISCONN_MSEC+PENDING_MSEC) + (REQUESTS_QUEUED*CYCLE_LENGTH_MSEC)/(TIME_RESOLUTION*60000)).
Device Busy Percentage Percentage of time the device is busy. Calculated as 100*(CONNECT_MSEC + DISCONN_MSEC)/(TIME_RESOLUTION*60000).
Average Device Wait Time per Request Average device wait time per request, in milliseconds. This is the average time that a request waited for the device. Calculated as DEVICE_BUSY_DELAY/MEASUREMENT_EVENTS.
Average Disconnect Time per Request Average disconnect time, in milliseconds per request. Calculated as DISCONN_MSEC/MEASUREMENT_EVENTS.
Requests Serviced per Second Number of requests serviced per second. Calculated as MEASUREMENT_EVENTS/(TIME_RESOLUTION*60).
Average Pending Time per Request Average pending time per request, in milliseconds This is the average time that a request waited for the device or control unit. Calculated as PENDING_MSEC/MEASUREMENT_EVENTS.
Average Queue Wait Time Average queue wait time, in milliseconds. This is the average time spent on the queue waiting for the UCB. Calculated as (REQUESTS_QUEUED*CYCLE_LENGTH_MSEC)/ MEASUREMENT_EVENTS.
Average Response Time per Request Average response time per request, in milliseconds. Calculated as ((CONNECT_MSEC+DISCONN_MSEC+PENDING_MSEC) + (REQUESTS_QUEUED*CYCLE_LENGTH_MSEC))/MEASUREMENT_EVENTS.
Average SIO Time per Request Average start SIO time spent per request, in milliseconds. Calculated as (CONNECT_MSEC+DISCONN_MSEC)/MEASUREMENT_EVENTS.