DATA Volume metrics
Unisphere collects and displays metrics for DATA volumes.
DATA volume metrics are supported only by storage systems (arrays) running HYPERMAX OS 5977 or PowerMaxOS 5978.
The following table lists all metrics that are available for DATA volumes.
| Metric | Description |
|---|---|
| Allocated Capacity (GB) | The total allocated volume capacity |
| BE % Reads | The percent of the back-end I/O that were read requests |
| BE % Writes | The percent of the back-end I/O that were write requests |
| BE MBs Read/sec | The number of MBs read by the disk directors from the volume each second |
| BE MBs Transferred/sec | Calculated value: (MBs read per sec + MBs written per sec) |
| BE MBs Written/sec | The number of MBs written to the volume from the disk director each second |
| BE Optimize Writes (MB) | Internal metric |
| BE Partial Sector Writes (KB) | The kilobytes of back-end I/O that were partial sector writes |
| BE Prefetched MBs/sec | The number of tracks per second prefetched from disk to cache upon detection of a sequential read stream |
| BE Prefetched Tracks Used/sec | The number of prefetched tracks used each second from the disk directors to the cache |
| BE Read Reqs/sec | The number of read requests each second performed by the disk directors to cache |
| BE Reads For Copy | Internal metric |
| BE Reads For Copy (KB) | Internal metric |
| BE Reqs/sec | The number of read/write requests each second performed by the disk directors to cache |
| BE Write Reqs/sec | The number of write requests each second performed by the disk directors to the cache |
| BE Writes For Copy | Internal metric |
| BE Writes For Copy (KB) | Internal metric |
| BE Writes For Rebuild | Internal metric |
| BE Writes For Rebuild (KB) | Internal metric |
| Device Block Size | The block size of the volume |
| IO Density | The number of BE requests per GB of disk |
| Kbytes Read for Rebuild | Kilobytes read for rebuild |
| Kbytes Written for IVTOC | Kilobytes written for IVTOC |
| Parity Generation Kbytes Read | Parity generation Kilobytes read |
| Reads for Rebuild | Reads for rebuild |
| Total Capacity (GB) | The total capacity of the volume (GBs) |
| WP Count | The number of tracks currently in write pending mode for the volume |
| Writes for IVTOC | Writes for IVTOC |