EMC Unity System Capacity Test

When automatic disk configuration is enabled in the EMC Unity storage system, the system allocates existing disks into a capacity, and/or performance and/or extreme performance pool, depending on the number and type of available disks. SAS disks are allocated in multiples of either 6 or 7 and these disks are collectively termed as disk groups. A spare disk may be assigned for the first 0 to 30 disks and occasionally, one disk will be left unassigned. In larger environments, the spare disks and unassigned disks may vary depending on the total number of disks. If the capacity of the disks in a disk group is full or if a disk in the disk group fails, the spare disk would be used from the disk group. If the spare disks and unassigned disks are used completely, then the disk group may be insufficient to store further data leading to data loss. Therefore, it is necessary to monitor the capacity of the disks in the disk groups and the number of spare disks and unassigned disks in each disk group. The EMC Unity System Capacity test helps administrators in this regard!

This test auto-discovers the disk groups in the target storage system and for each disk group, this test reports the total capacity and the number of drives, spare disks and the unassigned disks.

Target of the test : An EMC Unity Storage System

Agent deploying the test : A remote agent

Outputs of the test : One set of results for each Disk Group of the target storage system being monitored.

Configurable parameters for the test
Parameter Description

Test Period

How often should the test be executed.


The IP address of the storage system for which this test is to be configured.

UniSphere CLI Path

The eG agent uses the command-line utility, UEMCli.exe, which is part of the UniSphere Management Suite, to communicate with and monitor the storage device. To enable the eG agent to invoke the CLI, configure the full path to the CLI here.

Username and Password

Provide the credentials of a user possessing 'monitor' role to access the storage system in the Username and Password text boxes.

Confirm Password

Confirm the Password by retyping it in the Confirm Password text box.


Specify the duration (in seconds) beyond which this test should time out in the Timeout text box. The default is 300 seconds.

Detailed Diagnosis

To make diagnosis more efficient and accurate, the eG Enterprise embeds an optional detailed diagnostic capability. With this capability, the eG agents can be configured to run detailed, more elaborate tests as and when specific problems are detected. To enable the detailed diagnosis capability of this test for a particular server, choose the On option. To disable the capability, click on the Off option.

The option to selectively enable/disable the detailed diagnosis capability will be available only if the following conditions are fulfilled:

  • The eG manager license should allow the detailed diagnosis capability
  • Both the normal and abnormal frequencies configured for the detailed diagnosis measures should not be 0.
Measurements made by the test
Measurement Description Measurement Unit Interpretation

Each drive capacity

Indicates the average capacity of each drive in this disk group.



Total capacity

Indicates the total capacity of this disk group.



Total drives

Indicates the total drives available in this disk group.



Unconfigured drives

Indicates the number of drives that were unconfigured/unassigned in this disk group.



Spare drives

Indicates the number of spare drives that were available for use in this disk group.