SDX Storage - Repository Test

A storage repository consists of virtual disks and partitions created from a physical disk. If a storage repository runs out of disk space or is in an abnormal state, the VPX instances mapped to that repository will no longer be able to use the repository; this can bring the operations of the VPX instances to a standstill! This is why, it is important that the state and disk space usage of each storage repository is tracked continuously, and abnormalities immediately brought to the attention of administrators. The SDX Storage - Repository test helps with this!

Using this test, administrators can determine whether any storage repository is in a bad / abnormal state presently. The test also proactively alerts administrators to a potential space crunch on a repository, so that administrators can do what is necessary to prevent instance performance to suffer.

Target of the test : A NetScaler SDX

Agent deploying the test : A remote agent

Outputs of the test : One set of results for each storage repository.

Configurable parameters for the test
Parameter Description

Test Period

How often should the test be executed

Host

The host for which the test is to be configured.

SDX Username and SDX Password

To monitor a NetScaler SDX device, the eG agent should be configured with the credentials of a user with read-only privileges to the target device. Specify the credentials of such a user in the SDX Username and SDX Password text boxes.

Confirm Password

Confirm the password by retyping it here.

SSL

The eG agent collects performance metrics by invoking NITRO (NetScaler Interface Through Restful interfaces and Objects) APIs on the target NetScaler SDX device. Typically, the NITRO APIs can be invoked through the HTTP or the HTTPS mode. By default, the eG agent invokes the NITRO APIs using the HTTPS mode. This is why, the SSL flag is set to Yes by default. If the target NetScaler SDX device is not SSL-enabled, then the NITRO APIs can be accessed through the HTTP mode only. In this case, set the SSL flag to No.

Measurements made by the test

Measurement

Description

Measurement Unit

Interpretation

Status

Indicates the current state of this storage repository.

 

The values that this measure can report and their corresponding numeric values have been listed in the table below:

Numeric Value Measure Value
100 Good
0 Bad

Note:

By default, this measure reports the above-mentioned Measure Values to indicate the current state of a storage repository. However, in the graph of this measure, the Measure Values will be represented using their corresponding numeric equivalents only.

Disk size

Indicates the current capacity of this storage repository.

GB

 

Disk utilized

Indicates the amount of disk space in this storage repository that is utilized by the VPX instances.

GB

A low value is desired for this measure.

Disk free

Indicates the amount of disk space in this storage repository that is currently unused.

GB

A high value is desired for this measure.

Disk usage

Indicates the percentage of disk space in this storage repository that is in use.

Percent

Compare the value of this measure across storage repositories to know which repository is being used excessively.

Typically, a value close to 100% is a cause for concern, as it implies that the VPX instances are consuming disk space excessively. You may want to consider allocating more virtual disks to the instances, so that the potential storage contention is averted.