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# Thin Pool metrics

Unisphere collects and displays metrics for thin pools.

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 thin pools.

Table 1. Thin pool metrics
Metric | Description
--- | ---
% Used Capacity | The percent of the pools capacity that is used (V3)
Allocated Pool Capacity (GB) | The allocated pool capacity in GBs (V3)
Avg IO Size | Calculated value: (HA Kbytes transferred per sec/total IOs per sec)
Avg Read Size | Calculated value: (Kbytes read per sec/total reads per sec)
Avg Write Size | Calculated value: (Kbytes written per sec/total writes per sec)
BE % Reads | The percent of the back-end requests that were read requests
BE % Writes | The percent of the back-end requests that were write requests
BE Blocks Written For Copy (KB) | BE Blocks written for copy (V3)
BE Optimize Writes Throughput | Internal metric
BE Partial Sector Writes (KB) | The kilobytes of back-end I/O that were partial sector writes (V3)
BE Prefetched Throughput | The number of MBs prefetched from disk to cache in a second 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 Prefetched Tracks/sec | BE pre-fetched tracks per second
BE RDF Copy Throughput | Internal metric
BE RDF Copy/sec | Internal metric
BE Read Req/sec | The number of read requests each second performed by the disk directors to cache
BE Read RT | A calculated value of the response time for all back-end read requests
BE Reads For Copy | Internal metric (V3)
BE Reads For Copy (KB) | Internal metric (V3)
BE Reqs/sec | The number of read/write requests each second performed by the disk directors to cache
BE Response Time | A calculated value of the response time for all back-end read and write requests
BE Throughput Read | The number of MBs read each second by the disk directors
BE Throughput Transferred | The MBs transferred per second to the disk directors
BE Throughput Written | The number of MBs written each second by the disk directors
BE Write Req/sec | The number of write requests each second performed by the disk directors to cache
BE Write RT | A calculated value of the response time for all back-end write requests
BE Writes For Copy (KB) | Internal metric (V3)
BE Writes For Rebuild | Internal metric (V3)
BE Writes For Rebuild (KB) | Internal metric (V3)
Compression Scan Reads | Compression scan reads
Copy on Write | Copy on write
Device Block Size | The block size of the volume
Egress Tracks | The number of tracks leaving the pool
Enabled Pool Capacity (GB) | The enabled pool capacity in GBs (V3)
Ingress Tracks | The number of tracks entering the pool
IO Density | The number of BE requests per GB of disk -(BE Reads + BE Writes)/allocated capacity.
Redirect On Write | Redirect on write
Total Capacity (GB) | The total capacity of the thin pool (GBs) (V3)
Total Pool Capacity (GB) | The total pool capacity in GBs (V3)
Total Tracks | The number of allocated tracks in the thin pool
Used Pool Capacity (GB) | The used pool capacity in GBs (V3)
WP Count | The number of tracks currently in write pending mode for the thin pool
WP Used Capacity | WP used capacity