Disk Technology metrics
Unisphere collects and displays metrics for disk technologies.
Within the PM metrics section, V4 is used to denote that the metric is supported only by a storage system (array) running PowerMaxOS 10 (6079). V3 is used to denote that the metric is supported only by a storage system (array) running HYPERMAX OS 5977 or PowerMaxOS 5978. Metrics without the denotation are supported by all storage systems (arrays).
The following table lists all metrics that are available for disk technologies.
| Metric | Description |
|---|---|
| % Busy | The percentage of time that the disk group is busy serving I/Os |
| % Free Capacity | The percentage of the disk group capacity that is free |
| % Idle | The percentage of time the disk group is idle |
| % Used Capacity | The percentage of the disk group capacity that is allocated |
| Avg Read Size (KB) | The average number of kilobytes for a single read command |
| Avg Write Size (KB) | The average number of kilobytes for a single write command |
| IO Density | The number of BE requests per GB of disk. (BE Reads + BE Writes) /allocated capacity |
| IOs/sec | The total number of read and write I/Os per second |
| Number of Spare Hypers | Number of spare hypers (V4) |
| Read RT | The average time that it took the disk group to serve one read command |
| Reads/sec | The number of reads per second for the disk group |
| Rebuild Blocks Read/sec | The rebuild blocks read (V4) |
| Rebuild Blocks Written/sec | The rebuild blocks written (V4) |
| Response Time | The average time that it took the disk group to service I/Os |
| Throughput | The total number of MBs per second for the disk group |
| Throughput Read | The read throughput (MBs) of the disk group per second |
| Throughput Written | The write throughput (MBs) of the disk group per second |
| Total Capacity | The total capacity (in GB) of all the disks in the disk group |
| 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 group each second |
| Unmap Command Count | Unmap command count |
| Used Capacity (GB) | The total capacity (in GB) allocated for all the disks in the disk group |
| Write RT | The average time that it took the disk group to serve one write command |
| Writes/sec | The number of writes per second for the disk group |