VSP Gx00 Shared Memory Status Test

Shared memory resides by default on the first pair of cache boards in controller chassis. The usage of the shared memory increases when you install software features such as Copy-On-Write Snapshot or the Universal Replicator. The shared memory on each cache board contains 1 or 2 GB cache directory to safeguard write pending data in the cache if there is an unlikely case of double failure of the shared memory cache area. If the shared memory is running out of space or if there are too many write pendings to the shared memory, then data synchronization may take time resulting in poor accessibility of the data as well as data loss. Administrators should therefore constantly monitor the status of the shared memory. The VSP Gx00 Shared Memory Status test helps administrators in this regard.

This test reports the current status of the shared memory of each RAID store on the storage device.

Target of the test : A Hitachi VSP Gx00 Series storage device

Agent deploying the test : An external agent

Outputs of the test : One set of results for every RAID store on the Hitachi VSP Gx00 Series device monitored

The figure below depicts the test configuration page of this test. Click on the parameters in the figure below to know what they are and how to configure them.

Measures made by the test:
Measurement Description Measurement Unit Interpretation

Shared memory status:

Indicates the current status of the shared memory used by this RAID store.


The values reported by this measure and its numeric equivalents are mentioned in the table below:

Measure value

Numeric Value












By default, this measure reports the Measure Values listed in the table above to indicate the current status of the shared memory used by this RAID store. The graph of this measure however, represents the status of a server using the numeric equivalents only - 1 to 5.