Storage Domains Test

A data center relies on adequate and accessible physical storage. The storage pool is a logical entity that contains a standalone image repository of a certain type, either iSCSI ,or Fiber Channel, or NFS. Each Storage Pool may contain several storage domains, for Guests images, for ISO images and for Import/Export images.

If a storage domain becomes unavailable or runs out of space, then this will affect the operations of the VMs using that storage domain. To promptly detect the unavailability or abnormal usage of a storage domain and isolate the VMs that may be impacted by this, use the Storage Domains test.

Target of the Test: A RHEV Manager

Agent running the test: A remote agent

Output of the test: One set of results for each storage domain in each datacenter configured on the RHEV manager being monitored.

Configurable parameters for the test
Parameter Description

Test period

How often should the test be executed.


The host for which the test is to be configured.


The port at which the specified host listens. The default port is 8443.

RHEL MGR User and RHEL MGR Password

To pull out the desired metrics from the RHEV manager, this test has to be configured with the privileges of a user who has been assigned the RHEVMUser role. Specify the user name and password of this user in the RHEL MGR User and RHEL MGR Password text boxes, respectively.

Confirm Password

Confirm the RHEL MGR Password by retyping it here.

RHEL Manager Domain

Specify the domain to which the RHEV manager belongs. By default, internal is displayed here.


If the RHEV manager to which the eG agent should connect is SSL-enabled, then set this flag to Yes. If not, set it to No.

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

Is master storage domain?

Indicates whether/not this storage domain is the master storage domain in this data center.


This measure will report the value Yes if the storage domain is the master, and No if it is the slave.

The numeric values that correspond to the Yes/No values above are as follows:

Measure Value Numeric Value
Yes 1
No 0


By default, this measure reports one of the Measure Values listed in the table above. The graph of this measure however will represent the storage domain type (master/slave) using the numeric equivalents - ‘0’ or '1’.

Storage domain capacity

Indicates the current capacity of this storage domain.



Used space

Indicates the amount of storage space currently utilized by this domain.


Ideally, the value of this measure should be low.

Free space

Indicates the amount of storage space that is  currently available for use in this storage domain.


Ideally, the value of this measure should be high.

Committed space

Indicates the amount of storage space currently committed in this storage domain.



Storage domain space usage

Indicates the percentage of total storage space in this storage domain that is currently being utilized.


Compare the value of this measure across domains to identify the domain that is experiencing a space drain.

A high value or a consistent increase in this value is a cause for concern, as it indicates the steady erosion of storage space from a storage domain. If a storage domain runs out of space, it will affect the operations of all VMs that use that domain.

Storage domain availability in datacenter

Indicates whether/not this storage domain is currently available in the datacenter.


While the value 0 indicates that the storage domain is unavailable, the value 100 indicates that the storage domain is currently available.

If a storage domain used by a VM is rendered unavailable, users will be denied access to that VM.