Symmetrix Directors

The Symmetrix Directors attributes provide information about the disk directors on an EMC Symmetrix storage facility.

Cache Hit Pct: The percent of I/O activity that was satisfied without accessing the data from the disk drive itself over the interval. The interval corresponds to the cache interval.

Cache Hit Pct Long Interval: The percentage of prefetched tracks found in cache during a long interval. A long interval is cache hits since IPL or STATUS CLEAR command.

Cache Hit Pct Short Interval: The percentage of prefetched tracks found in cache during a short interval. A short interval can be up to 10 minutes.

Cache Hits Long Interval: The count of cache hits since IPL or STATUS CLEAR command.

Cache Hits Short Interval: The count of cache hits during a short interval. A short interval can be up to 10 minutes.

Cache Misses Long: The number of cache misses during a long interval.

Cache Misses Short: The number of cache misses during a short interval.

CCW Count: Total CCW chains over the interval. The interval corresponds to the cache interval.

CCWs per Second: The rate of CCW chains per second over the interval. The interval corresponds to the cache interval.

Director Function: The type of director.

Director Index: The ID of this director.

Director Integer: Director ID as an integer.

Director Number: Identifies the disk director.

Director Type: The type of director.

I/O Count: Total I/O operations over the interval. The interval corresponds to the cache interval.

I/O per Second: The rate of I/O operations per second over the interval. The interval corresponds to the cache interval.

I/O Requests Long Interval: The number of I/O requests for a long interval.

I/O Requests Per Second Long Interval: The average number of I/O requests per second during a long interval. A long interval is since IPL or the STATUS CLEAR command.

I/O Requests Per Second Short Interval: The average number of I/O requests per second during a short interval. A short interval can be up to 10 minutes.

I/O Requests Short Interval: The number of I/O requests for a short interval.

I/Os Per Second Long Interval: The average number of I/O operations per second during a long interval. A long interval is since IPL or STATUS CLEAR command.

I/Os Per Second Short Interval: The average number of I/O operations per second during a short interval. A short interval can be up to 10 minutes.

Long Cache Miss: The number of cache misses that were not satisfied by tracks that were in the process of being prefetched over the interval. The interval corresponds to the cache interval.

Long Cache Miss Pct: The percent of cache misses that were not satisfied by tracks that were in the process of being prefetched over the interval. The interval corresponds to the cache interval.

Long Interval: A long measurement interval expressed as hours, minutes, and seconds.

Managed System: The SMS name of this system.

Prefetched Tracks: The number of prefetched tracks over the interval. The interval corresponds to the cache interval.

Prefetched Tracks Unused: The number of prefetched tracks over the interval that were not referenced. The interval corresponds to the cache interval.

Prefetched Tracks Used: The number of prefetched tracks over the interval that were referenced. The interval corresponds to the cache interval.

Prefetched Tracks Used Pct: The percent of prefetched tracks over the interval that were referenced. The interval corresponds to the cache interval.

Prefetched Tracks Percent Used: The percentage of prefetched tracks used.

Serial Number Index: The eight low order characters of serial number which serve as the control unit index.

Short Cache Miss: The number of cache misses that were satisfied by tracks that were in the process of being prefetched over the interval. The interval corresponds to the cache interval.

Short Cache Miss Pct: The percent of cache misses that were satisfied by tracks that were in the process of being prefetched over the interval. The interval corresponds to the cache interval.

Short Interval: A short measurement interval expressed as hours, minutes, and seconds.

SSID Index: The SSID to which this director is attached.

SSID: The subsystem ID of the Symmetrix control unit controlling this disk director.

Time Stamp: Displays the date and time this data was collected from the virtual tape server (VTS).

Total CCW Chains: The total number of I/O requests handled by the director.

Total I/Os Long Interval: The total I/Os (reads and writes) for a long interval.

Total I/Os Short Interval: The total I/Os (reads and writes) for a short interval.

Total I/Os: The total number of I/Os.

Total Prefetch Cache Hits: The total number of prefetch cache hits.

Total Prefetch Tasks: The number of prefetch tasks.

Total Tracks Prefetched: The total number of prefetched tracks.

Total Write requests: Total write requests.

Unused Prefetch Tracks: The number of unused prefetch tracks.

Used Prefetch Tracks: The number of used prefetch tracks.

Write Pct Long Interval: The percentage of write commands during a long interval. The value is (Write channel commands) / (Reads and writes) A long interval is since IPL or STATUS CLEAR command.

Write Pct Short Interval: The percentage of write commands during a short interval. Write channel commands divided by reads and writes. A short interval can be up to 10 minutes.

Write Percent: The percent of write requests over the interval in tenths of a percent. The interval corresponds to the cache interval.

Write Requests: The number of write requests over the interval. The interval corresponds to the cache interval.

Write Requests Long Interval: The count of write requests during a long interval.

Write Requests Short Interval: The count of write requests during a short interval.