Release Notes

32 Dell PS Series Snapshots and Clones: Best Practices and Sizing Guidelines | BP1027
7.5 Monitoring snapshot reserve
As mentioned in the section titled, “Snapshot reserve”, the default setting allocates snapshot reserve equal to
100% of the volume size (reserve). The default settings also include a warning threshold of 90%. Both of
these defaults can be changed to affect new volumes at any time, either globally, or per volume. Existing
volumes will not be affected.
When the amount of snapshot reserve used reaches the threshold, Dell EqualLogic Group Manager displays
a warning condition as well as a message in the event log. Optionally notifications can be configured to be
sent by email, logged to a syslog server, and collected by SAN HQ.
SAN HQ can also be used to monitor snapshots and reserve usage. Detailed information ranges from overall
utilization of an entire group (or groups), to pools, or a specific volume. Because SAN HQ tracks usage over
time, administrators can use it to monitor trends and plan for future storage needs. The following diagram
shows an example of volume and snapshot reserve usage over a period of time as viewed in SAN HQ.
PS Series SAN HQ – Volume & Snapshot Reserve