This class represents a logical disk in the system. The following metrics are associated to IBMzOS_LogicalDisk:
| Property type | Property value | Property type | Property value |
|---|---|---|---|
| ActiveTimePercentage | |||
| Description: Percentage
of time the disk unit was actively processing requests, calculated
as the sum of connect, disconnect and pending time.
This metric cannot exceed 100%, and it does not state how many requests were active at any given time. |
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| Datatype | real32 | Units | percent |
| ChangeType | 4 (Gauge) | TimeScope | 3 (Interval) |
| GatheringType | 3 (Periodic) | IsContinuous | true |
| DDS metric name | % active time | DDS metric ID | 8D0010 |
| Associated class | IBMzOS_LogicalDisk | ||
| AvailableSpace | |||
| Description: Free capacity on the disk drive. | |||
| Datatype | uint64 | Units | bytes |
| ChangeType | 4 (Gauge) | TimeScope | 2 (Point) |
| GatheringType | 3 (Periodic) | IsContinuous | true |
| DDS metric name | freespace | DDS metric ID | 8D3090 |
| Associated class | IBMzOS_LogicalDisk | ||
| AverageDeviceUtilization | |||
| Description: Average device
utilization (not normalized to 100% for parallel I/O activity).
This metric can be above 100% if the device is executing multiple I/Os in parallel. A busy time percentage of 200% means that on average, the device was executing two I/Os in parallel. This metric does not tell you whether the busy time of the measured device could be even higher, because this is architecture dependent. |
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| Datatype | real32 | Units | percent |
| ChangeType | 4 (Gauge) | TimeScope | 3 (Interval) |
| GatheringType | 3 (Periodic) | IsContinuous | true |
| DDS metric name | i/o activity rate and response time | DDS metric ID | based on 8D0E90 and 8D10F0 |
| Associated class | IBMzOS_LogicalDisk | ||
| Capacity | |||
| Description: Capacity of the disk drive. | |||
| Datatype | uint64 | Units | bytes |
| ChangeType | 4 (Gauge) | TimeScope | 2 (Point) |
| GatheringType | 3 (Periodic) | IsContinuous | true |
| DDS metric name | capacity | DDS metric ID | 8D2FF0 |
| Associated class | IBMzOS_LogicalDisk | ||
| FastWriteRate | |||
| Description: Rate of write operations executed as fast writes. | |||
| Datatype | real32 | Units | 1/s |
| ChangeType | 4 (Gauge) | TimeScope | 3 (Interval) |
| GatheringType | 3 (Periodic) | IsContinuous | true |
| DDS metric name | cache DFW hits (all systems) | DDS metric ID | 8D21D0 |
| Associated class | IBMzOS_LogicalDisk | ||
| IOIntensity | |||
| Description: I/O utilization indicator: IOIntensity = ResponseTime * IORate | |||
| Datatype | real32 | Units | milliseconds per second |
| ChangeType | 4 (Gauge) | TimeScope | 3 (Interval) |
| GatheringType | 3 (Periodic) | IsContinuous | true |
| DDS metric name | i/o intensity | DDS metric ID | 8D1290 |
| Associated class | IBMzOS_LogicalDisk | ||
| QueueDepth | |||
| Description: Average number of I/O requests currently in queue (OS view). | |||
| Datatype | real32 | Units | s/s = I/O request rate [1/s] * average response time [ms] / 1000 |
| ChangeType | 4 (Gauge) | TimeScope | 3 (Interval) |
| GatheringType | 3 (Periodic) | IsContinuous | true |
| DDS metric name | i/o activity rate and response time | DDS metric ID | based on 8D0E90 and 8D10F0 |
| Associated class | IBMzOS_LogicalDisk | ||
| ReadCacheHitRate | |||
| Description: Rate of read requests that did not need access to disk drives because data was available in cache. | |||
| Datatype | real32 | Units | 1/s |
| ChangeType | 4 (Gauge) | TimeScope | 3 (Interval) |
| GatheringType | 3 (Periodic) | IsContinuous | true |
| DDS metric name | cache read hits (all systems) | DDS metric ID | 8D2280 |
| Associated class | IBMzOS_LogicalDisk | ||
| RequestRate | |||
| Description: Number of I/O requests per second for the associated device. | |||
| Datatype | real32 | Units | 1 / s (events per second ) |
| ChangeType | 4 (Gauge) | TimeScope | 3 (Interval) |
| GatheringType | 3 (Periodic) | IsContinuous | true |
| DDS metric name | i/o activity rate | DDS metric ID | 8D0E90 |
| Associated class | IBMzOS_LogicalDisk | ||
| ResponseTime | |||
| Description: ResponseTime
associated to a logical disk drive. The average response time (in
milliseconds) that the device required to complete an I/O request.
For comparison of average response times on different platforms, please
keep in mind that this metric may be reported by the disk device itself
or it may be computed by the operating system, beginning at the point
in time when an application issues a disk related command and ending
at the point in time when the data is returned. In this case, the
queue times, network times and other components of response time are
included in the ResponseTime metric.
In z/OS, this metric represents the operating system view of the disk response time. |
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| Datatype | real32 | Units | milliseconds |
| ChangeType | 4 (Gauge) | TimeScope | 3 (Interval) |
| GatheringType | 3 (Periodic) | IsContinuous | true |
| DDS metric name | response time | DDS metric ID | 8D10F0 |
| Associated class | IBMzOS_LogicalDisk | ||
| WaitTime | |||
| Description: WaitTime associated
to a logical disk drive.
This metric comprises an estimation of the delay components of ResponseTime (in milliseconds), or AverageResponseTime minus service time, and the time spent in queues. |
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| Datatype | real32 | Units | milliseconds |
| ChangeType | 4 (Gauge) | TimeScope | 3 (Interval) |
| GatheringType | 3 (Periodic) | IsContinuous | true |
| DDS metric name | % connect time and response time | DDS metric ID | based on 8D00B0 and 8D10F0 |
| Associated class | IBMzOS_LogicalDisk | ||