Disk Group metrics
Unisphere for PowerMax collects and displays metrics for disk groups.
Within the PM metrics section, storage systems (arrays) running PowerMaxOS 10 (6079) supports metrics that are denoted with V4. A storage system (array) running HYPERMAX OS 5977 or PowerMaxOS 5978 supports metrics that are denoted with V3. All storage systems (arrays) support metrics that have no denotation.
The following table lists all metrics that are available for disk groups.
| Metric | Description |
|---|---|
| % Busy | The percentage of time that the disk is busy serving I/Os |
| % Free Capacity | The percentage of the disk that is free |
| % Idle | The percentage of time the disk is idle |
| % Used Capacity | The percentage of the disk group capacity that is allocated. |
| Avg Read Size (KB) | Calculated value: (Kbytes read per sec/total reads per sec) |
| Avg Write Size (KB) | Calculated value: (Kbytes written per sec/total writes per sec) |
| IO Density | The number of BE requests per GB of disk |
| IOs/sec | The number of I/O commands to the disk |
| Read RT | The average time that it took the disk to serve one read command |
| Reads/sec | The number of host reads per second for the disk. |
| Rebuild Block Read/sec | The rebuild blocks read per second (V4) |
| Rebuild Blocks Written/sec | The rebuild blocks written per second (V4) |
| Response Time | The average response time for the reads and writes |
| Spare Hypers Count | The spare hypers count (V4) |
| Throughput | The total I/O (reads and writes) per second in MBs |
| Throughput Read | The average throughput of host MBs read (per second) by the director |
| Throughput Written | The average throughput of host MBs written (per second) by the director |
| Total Capacity | The total capacity of the disk (GBs) |
| Total SCSI Commands/sec | The total number of read commands, write commands, skip mask commands, verify commands, XOR write commands, and XOR write-read commands performed by the disk each second. |
| Unmap Command Count | The unmap command count |
| Used Capacity | The total used capacity of the disk (GBs) |
| Write RT | The average time that it took the disk to serve one write command |
| Writes/sec | The number of host writes per second for the disk |