External Director metrics
Unisphere collects and displays metrics for external directors.
External Director 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 external directors.
| Metric | Description |
|---|---|
| % Busy | The percentage of time that a director is busy |
| % Read Reqs | The percent of read requests out of the total requests |
| % Write Reqs | The percent of write requests out of the total requests |
| Avg Time per Syscall | The average time spent processing all system calls |
| Clone Copy Read | Measures, in tracks/sec, the backend read traffic that is not immediately associated to front-end I/O |
| Clone Copy Write | Measures, in tracks/sec, the backend write traffic that is not immediately associated to front-end I/O |
| IOs/sec | The number of I/Os performed each second by the director |
| MBs Read/sec | The number of reads per second in MBs |
| MBs Written/sec | The number of writes per second in MBs |
| MBs/sec | The total I/O (reads and writes) per second in MBs |
| Optimized Write | Internal metric |
| PHCO Rebuild Copy | Internal metric |
| PHCO Rebuild Read | Internal metric |
| Prefetched Tracks/sec | The number of tracks prefetched from disk to cache upon detection of a sequential read stream |
| Read Reqs/sec | A data transfer of a read between the director and the cache |
| Reqs/sec | A data transfer between the director and the cache - an I/O may require multiple requests depending on I/O size, alignment or both. For writes the request counter increments at the time that the write pending flag is removed from the cache slot. If multiple DAs are involved in the I/O operation (such as RAID 1), the request count may not reconcile with the I/O count and I/O size |
| Syscall Count/sec | The total number of calls seen by this director |
| Syscall RDF Dir Count/sec | The number of calls that are sent using SRDF to a remote system |
| Syscall Remote Dir Count/sec | The number of calls that are sent from the local director to another director in the same system |
| Syscall Time/sec | Total time spent processing all system calls |
| Write Reqs/sec | A data transfer of a write between the cache and the director |