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# SRP metrics

Unisphere collects and displays metrics for SRPs.

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).

For V3 arrays, performance metrics were reported at the SRP level. For V4 arrays, where an SRP has multiple emulations, performance metrics are reported at the emulation levels. For SRPs without multiple emulations, the performance metrics continue to be reported at the high level SRP level.

The following table lists all metrics that are available for SRPs.

Table 1. SRP metrics
Metric | Description
--- | ---
% Physical Used | Physical Used (V4)
% Effective Resources Used | Current Effective resource Used Capacity Percentage (V4)
% Effective Used Capacity | Percentage of Effective Used Capacity
% Physical Used Capacity | Physical Used Capacity percentage
% Provisioned | Percentage of Capacity that is Provisioned(V4)
% Reducing Capacity | This is the percentage of used effective capacity which is both enabled for reduction and is also reducible(V4)
% Snapshot Effective Used | Percent Effective Snapshot Used capacity as part of Effective Capacity (V4)
% Snapshot Physical Used | Percent Physical Snapshot Used capacity as part of Max TBu (V4)
% Snapshot Resources Used | Capacity used by Snapshots as part of Snapshot Metadata in percent (V4)
% Snapshot Saved | Percentage savings of the sum of all TDEV Snapshot sizes (at the time of Snapshot creation) and the TDEV Snapshot Allocated Storage (V3)
% Virtual Provisioning Saved | Percentage savings of the TDEV configured storage that is presented to the hosts and the TDEV Allocated Storage (V3)
BE Read Req/sec | The number of read requests each second performed by the disk directors to cache
BE Reqs/sec | The number of read/write requests each second performed by the disk directors to cache
BE Throughput Read | The number of MBs read by the disk directors from the disk each second (V4)
BE Throughput Transferred | Calculated value: (MBs read per sec + MBs written per sec) (V4)
BE Throughput Written | The number of MBs written to the disk from the disk director each second
BE Write Req/sec | The number of write requests each second performed by the disk directors to cache (V4)
Compression Dedup Savings Capacity | Total capacity saved due to compression and DeDup (both TDEVs and snapshots) (V4)
Data Reduction Ratio | Data Reduction Ratio on Reducible (V4)
Disabled Capacity | Total capacity not enabled for data reduction (V4)
Physical Capacity | Physical Capacity
Effective Resources Capacity | Max SRP-per-Emulation Metadata TBe in units of Capacity
Effective Snapshot Used Capacity | Current effective snapshot used capacity
Effective Used Capacity | Effective Used Capacity (V4)
Host IOs/sec | The number of host I/O operations performed each second, including writes and random and sequential reads (V3)
Host Reads/sec | Host read operations performed each second by the SRP
Host Throughput | The number of host MBs read each second
Host Throughput Read | The cumulative number of host MBs read per second by the SRP (V3)
Host Throughput Written | The cumulative number of host MBs written per second by the SRP (V3)
Host Writes/sec | Host write operations performed each second by the SRP (V4)
Overall Compression Ratio | Ratio of the sum of all TDEVs + snapshot sizes (calculated based on the 128K track size) and the Physical Used Storage (calculated based on the compressed pool track size) (V3)
| NOTE: Compression ratio metrics are supported only on systems capable of compression. Any value reported on a system that is not capable of compression should be disregarded.
Overall Efficiency Ratio | Ratio of the sum of all TDEVs + snapshot sizes (calculated based on the 128K track size) and the Physical Used Storage (calculated based on the compressed pool track size) (V3)
Pattern Detection Savings | Total capacity saved due to pattern detection (both TDEVs and snapshots) (V4)
Physical Capacity | Max SRP-per-Emulation Disk TBe in units of Capacity (V4)
Provisioned Capacity | Provisioned Capacity
Read RT | The average time that it took the system to serve one read I/O for this SRP (V4)
Reducible Capacity | Total reducible capacity (both TDEVs and snapshots) (V4)
Response Time | The average time that it takes to satisfy I/O requests
Sized Data Reduction Ratio | Sized Data Reduction Ratio (V4)
Snapshot Compression Ratio | Ratio of the RDP Logical Backend Storage (calculated based on the 128K track size) and the RDP Physical Used Storage of the RDP space (calculated based on the compressed pool track size) (V3).
| NOTE: Compression ratio metrics are supported only on systems capable of compression. Any value reported on a system that is not capable of compression should be disregarded.
Snapshot Efficiency Ratio | Ratio of the sum of all snapshot sizes and the RDP Logical Backend Storage (V3)
Snapshot Resources Capacity | Max Snapshot Metadata Capacity on the system in capacity units (V4)
Snapshot Resources Used | Capacity currently used by Snapshots as part of Snapshot Metadata (V4)
Snapshot Shared Ratio | Ratio of the Snapshot Allocated Storage and the RDP Logical Backend Storage. Sum of all modified tracks on all snapshots/Sum of the RDP size for all snapshot (V3)
Threshold for Over Provisioning | Over provisioning threshold for the SRP (V4)
Total Effective Capacity | Max Effective Capacity (V4)
Total Snapshot Allocated Capacity (GB) | Capacity allocated with snapshots in GB (V3)
Total SRP Capacity (GB) | The total amount of capacity available in all SRPs in GB (V3)
Unevaluated Capacity | Capacity enabled but not yet evaluated for data reduction (V4)
Unreducible Capacity | Total unreducible capacity (both TDEVs & snapshots) (V4)
Used SRP Capacity (GB) | The amount of used capacity in all SRPs in GB (V3)
User Used Capacity | Total user used capacity (V4)
Virtual Provisioning Compression Ratio | Ratio of the TDEV Logical Backend Storage (calculated based on the 128K track size) and the TDEV Physical Used Storage (calculated based on the compressed pool track size) (V3)
| NOTE: Compression ratio metrics are supported only on systems capable of compression. Any value reported on a system that is not capable of compression should be disregarded.
Virtual Provisioning Efficiency Ratio | Ratio of the TDEV configured storage and the TDEV Logical Backend Storage (calculated based on TDEV allocated tracks without shared unowned) (V3)
Virtual Provisioning Shared Ratio | Ratio of the TDEV allocated storage and the TDEV Logical Backend Storage - Backend Storage is the sum of TDEV allocated tracks without counting the TDEV shared unowned tracks (V3)
Write RT | The average time that it took the system to serve one write I/O for this SRP