NAS System Volumes Test

A volume or logical drive is a single accessible storage area with a single file system, typically (though not necessarily) resident on a single partition of a hard disk. If a single disk volume in the QNAP NAS system is over-utilized, it can damage the user experience with the entire storage system. It is hence the responsibility of the storage administrator to keep an eye out for space contentions and processing bottlenecks with each of the disk volumes in the QNAP NAS, detect such anomalies even before they occur, and resolve them before users complain. The NAS System Volumes test helps the storage administrator discharge his duties efficiently. This test auto-discovers the disk volumes and reports the disk space utilization of each of the volumes. This enables administrators to proactively detect a potential disk space contention, identify which disk volume is running out of space, and resolve the problem before it is out of control.

Target of the test : A QNAP NAS system

Agent deploying the test : An external agent

Outputs of the test : One set of results for each disk volume of the QNAP NAS system that is to be monitored.

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 specified host listens. By default, this is NULL.


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 firewall. 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.


If the value chosen is Yes, then the QNAP NAS system under consideration is a passive server in a QNAP NAS system cluster. No alerts will be generated if the system is not running. Measures will be reported as "Not applicable" by the agent if the system is not up.

Measurements made by the test
Measurement Description Measurement Unit Interpretation


Indicates the current state of this disk volume.


The values that this measure reports and their corresponding numeric equivalents are shown in the table below:

Numeric Value Measure Value
1 Ready
2 No Disk


By default, this measure reports the above-mentioned Measure Values to indicate the current state of this disk volume. However, the graph of this measure will represent the same using the numeric equivalents only.

Total volume

Indicates the total amount of space available in this disk volume.



Used volume

Indicates the amount of space that is already utilized in this disk volume.


Ideally, the value of this measure should be low. If this value grows close to that of the Total volume measure, then you may consider adding more space to the volume, or free up the space in the volume by deleting unnecessary data.

Free volume

Indicates the amount of space that is currently available for use in this disk volume.


A high value is desired for this measure. A gradual/sudden decrease in the value of this measure indicates that the disk volume is currently running out of space.

Free percentage

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


A high value is desired for this measure. A value close to 0 indicates that the disk volume is currently running out of space.