VMAX3, VMAX All Flash, PowerMax: "The Snapshot capacity for SRP has changed to <NN> Percent." threshold alert

An instance of the Solutions Enabler storevntd daemon sends event ID 1513 to the specified log events targets. Supported target types are: snmp, syslog, system, file

An example of the event sent to a file target:

Event ID 1513 is an event named "SYMAPI_AEVENT2_UID_ALERT_FAST_SRP_FREE_CAP_CHANGE."
Event ID 1513 does not map to a Unisphere for PowerMax Policy Name.

A single alert is generated when the Storage Resource Pool (SRP) Capacity where Snapshot allocations can reside has reached the percent used for the following thresholds:

Snapshot allocations cannot reside in the SRP's Reserved Capacity (which is exclusively for Thin Device (TDEV) Write allocations). So the Usable Capacity for Snapshot allocations is determined as the SRP Usable Capacity - Reserved Capacity. This Usable Capacity is then used for both TDEV Write and Snapshot allocations. 

The Percent Used for this Alert is calculated as:

Alert 1513 informs that the Percent Used of the SRP where Snapshot allocations can reside has reached the specific threshold value, where the allocations are for both TDEV Writes and Snapshots. 

Therefore, an increase in TDEV Writes or Snapshot creation or both can trigger this Alert.  

If the Percent Used crosses the next threshold boundary, a new event is generated.

If the Percent Used remains lower than the last threshold alerted on, no new events are generated.

If the Alert is received and the higher threshold values are exceeded and notified by a new Alert, then the SRP allocations must be reduced. This is done by deleting TDEV allocations or Snapshot allocations or both.

It is recommended to review KB article VMAX3, VMAX All Flash, PowerMax: Storage Resource Pool (SRP) threshold alert. This article explains that the SRP Effective Used Capacity should be monitored and the appropriate actions should be taken.