LH Cluster Volume Space Test

A volume is a logical subdivision in a storage cluster. If a single volume in the Lefthand storage cluster is running out of space, it can rupture the user experience with the entire storage cluster. Therefore, it is necessary to monitor the space utilization of the volumes round the clock! The LH Cluster Volume Space test helps you in this regard!

This test auto-discovers the volumes in the storage cluster and reports the space utilization of each volume. By closely monitoring the volumes, administrators can figure out whether/not any volume has been grossly over-utilized. This way, the test turns the spotlight on volumes that are experiencing potential space crunch.

Target of the test : A LeftHand SAN Node

Agent deploying the test : An external agent

Outputs of the test : One set of results for each volume on the target storage cluster.

Configurable parameters for the test
Parameter Description

Test Period

How often should the test be executed.


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


The port at which the monitored target exposes its SNMP MIB; The default value is 161.


By default, the eG agent supports SNMP version 1. Accordingly, the default selection in the SNMPVersion list is v1. However, if a different SNMP framework is in use in your environment, say SNMP v2 or v3, then select the corresponding option from this list.


The SNMP community name that the test uses to communicate with the storage node. This parameter is specific to SNMP v1 and v2 only. Therefore, if the SNMPVersion chosen is v3, then this parameter will not appear.


This parameter appears only when v3 is selected as the SNMPVersion. SNMP version 3 (SNMPv3) is an extensible SNMP Framework which supplements the SNMPv2 Framework, by additionally supporting message security, access control, and remote SNMP configuration capabilities. To extract performance statistics from the MIB using the highly secure SNMP v3 protocol, the eG agent has to be configured with the required access privileges – in other words, the eG agent should connect to the MIB using the credentials of a user with access permissions to be MIB. Therefore, specify the name of such a user against this parameter.


This parameter appears only when v3 is selected as the SNMPVersion. An SNMP context is a collection of management information accessible by an SNMP entity. An item of management information may exist in more than one context and an SNMP entity potentially has access to many contexts. A context is identified by the SNMPEngineID value of the entity hosting the management information (also called a contextEngineID) and a context name that identifies the specific context (also called a contextName). If the Username provided is associated with a context name, then the eG agent will be able to poll the MIB and collect metrics only if it is configured with the context name as well. In such cases therefore, specify the context name of the Username in the Context text box. By default, this parameter is set to none.


Specify the password that corresponds to the above-mentioned Username. This parameter once again appears only if the SNMPVersion selected is v3.

Confirm Password

Confirm the AuthPass by retyping it here.


This parameter too appears only if v3 is selected as the SNMPversion. From the Authtype list box, choose the authentication algorithm using which SNMP v3 converts the specified username and password into a 32-bit format to ensure security of SNMP transactions. You can choose between the following options:

  • MD5 – Message Digest Algorithm
  • SHA – Secure Hash Algorithm


This flag appears only when v3 is selected as the SNMPversion. By default, the eG agent does not encrypt SNMP requests. Accordingly, the this flag is set to No by default. To ensure that SNMP requests sent by the eG agent are encrypted, select the Yes option.


If this EncryptFlag is set to Yes, then you will have to mention the encryption type by selecting an option from the EncryptType list. SNMP v3 supports the following encryption types:

  • DES – Data Encryption Standard
  • AES – Advanced Encryption Standard


Specify the encryption password here.

Confirm Password

Confirm the encryption password by retyping it here.


Specify the duration (in seconds) within which the SNMP query executed by this test should time out in this text box. The default is 10 seconds.

Data Over TCP

By default, in an IT environment, all data transmission occurs over UDP. Some environments however, may be specifically configured to offload a fraction of the data traffic – for instance, certain types of data traffic or traffic pertaining to specific components – to other protocols like TCP, so as to prevent UDP overloads. In such environments, you can instruct the eG agent to conduct the SNMP data traffic related to the monitored target over TCP (and not UDP). For this, set this flag to Yes. By default, this flag is set to No.

Measurements made by the test
Measurement Description Measurement Unit Interpretation

Total space

Indicates the total size of this volume.


Provisioned space

Indicates the space provisioned for this volume while created.


Used space

Indicates the space that was already utilized on this volume.


A low value is desired for this measure.

Compare the value of this measure across volumes to determine the volume that is utilizing the maximum space.

Free space

Indicates the space that is available for use in this volume.


A high value is desired for this measure.

Volume space utilization

Indicates the percentage of space that is utilized in this volume.


A high value for this measure indicates that the volume is currently running out of space. Administrators can either clear unwanted data on the volume or add additional resources.

Allocated space used

Indicates the percentage of space already utilized from this volume against the allocated space for this volume.


Free space pct

Indicates the percentage of space that is available for use in this volume.


A high value is desired for this measure. A value close to 0 is a cause of concern.

Allocated free space

Indicates the percentage of space that is available for use from this volume against the allocated space.


Cluster space used by volume

Indicates the percentage of space utilized by this volume on the storage cluster.