EQ Member Test

A PS Series group is comprised of a single PS Series array or multiple arrays working together. Each array in a group is called a member. A member is a fully-functional, high-performance, highly-available storage array with mirrored write-back caches and multiple storage network connections.

Each member is composed of redundant components - disks, controllers with mirrored write-back caches, network interfaces, power supplies, and cooling fans.

This test monitors the space usage of the each member, and promptly alerts you if disk space in any member array is over-utilized. In addition, the test reports the number of controllers and disks in each member array, and periodically checks the array temperature to report abnormalities (if any).

Target of the test : Dell EqualLogic PS Series SAN

Agent deploying the test : A remote agent

Outputs of the test : One set of results for each member array monitored.

Configurable parameters for the test
Parameter Description

Test Period

How often should the test be executed.

Host

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

Port

The port at which the device listens. By default, this will be NULL.

SNMPPort

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

SNMPVersion

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.

SNMPCommunity

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.

UserName

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. 

Context

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.

AuthPass

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.

AuthType

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

EncryptFlag

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. 

EncryptType

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

EncryptPassword

Specify the encryption password here.

Confirm Password

Confirm the encryption password by retyping it here.

Timeout

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 space in this member, currently.

GB

 

Used space

Indicates the amount of space in this member currently in use.

GB

Ideally, the value of this measure should be low. If the value is very close to that of the Total space measure, it indicates that the member is running out of disk space. This can severely hamper the performance of applications that use the array for storage.

Number of controllers

Indicates the number of controllers in this member array, currently.

Number

 

Number of disks


Indicates the number of disks in this member array, currently,

Number

 

Number of connections

Indicates the number of iSCSCI initiators that are currently connected to this member array.

Number

An initiator is a client of an SCSI interface, via IP, that issues commands to request services from components, logical units of a server known as a target. A SCSI transport maps the client-server SCSI protocol to a specific interconnect. An initiator is one endpoint of a SCSI transport and a target is the other endpoint.

This is a good indicator of the load on the array.

Average temperature

Indicates the average temperature of this member array.

Celcius

A low value is desired for this measure.

Temperature status

Indicates the current temperature status of this member array.

 

This measure reports Good or Bad as the temperature status of the member.

The numeric values that correspond to the above-mentioned states are as follows:

 

State Numeric Value
Good 100
Bad 0

Note:

By default, this measure reports the above-mentioned States while indicating the temperature status of the array. However, in the graph of this measure, temperature status will be represented using the corresponding numeric equivalents - i.e., 0 and 100.

Free space

Indicates the free disk space that is currently available in this member array.

GB

A high value is desired for this measure.

Free percentage

Indicates the percentage of space in this member array that is currently free.

GB

A high value is desired for this measure. A very low value indicates excessive utilization of the disk space in the array. This can severely hamper the performance of applications that use the array for storage.