PowerEdge Virtual Disks Test

VRTX’s Shared PowerEdge Raid Controller (SPERC) allows RAID groups to be configured and then allows for those RAID groups to be subdivided into individual virtual disks that can be presented out to either single or multiple blades.

If one/more of these virtual disks experience critical issues or fail, then they will be rendered unusable by the blade servers. In the absence of sufficient virtual disk space, blade server performance will begin to degrade shortly thereafter. To make sure that the blade servers are able to maintain high levels of performance at all times, virtual disk health should be monitored continuously, problems captured instantly, and administrators notified of these problems promptly. This is precisely what the PowerEdge Virtual Disks test does!

This test monitors every virtual disk configured in the VRTX and tracks the current health and operational status of each virtual disk. In the process, the test highlights those virtual disks that are deviating from the norm and draws administrator attention to them.

Target of the test : A Dell PowerEdge VRTX

Agent deploying the test : An external agent

Outputs of the test : One set of results for each virtual disk of the VRTX being 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

Health status

Indicates how healthy this physical disk currently is.

 

The values that this measure can report and their corresponding numeric values are discussed below:

Measure Value Numeric Value
Other 1
Unknown 2
Normal 3
NonCritical 4
Critical 5
NonRecoverable 6

Note:

By default, this measure reports one of the Measure Values listed above to indicate the current health of a virtual disk. In the graph of this measure however, the same is represented using the numeric equivalents only.

Operation status

Indicates the current operational status of this virtual disk.

 

The values that this measure can report and their corresponding numeric values are discussed below:

Measure Value Numeric Value
Failed 0
Unknown 1
Online 2
Degraded 4

Note:

By default, this measure reports one of the Measure Values listed above to indicate the current operational status of the virtual disk. In the graph of this measure however, the same is represented using the numeric equivalents only.

Disk size

Indicates current capacity of this virtual disk.

GB

 

Diskstrip size

Indicates the current stripe size of this virtual disk.

GB

The values that this measure can report and their corresponding numeric values are discussed below:

Measure Value Numeric Value
Other 1
Default 2
520 bytes 3
1 KB 4
2 KB 5
4 KB 6
8 KB 7
16 KB 8
32 KB 9
64 KB 10
128 KB 11
256 KB 12
512 KB 13
1 MB 14
2 MB 15
4 MB 16
8 MB 17
16 MB 18

Note:

By default, this measure reports one of the Measure Values listed above to indicate the stripe size of the virtual disk. In the graph of this measure however, the same is represented using the numeric equivalents only.

Read policy

Indicates the read policy used by the controller to read from this virtual disk.

 

The values that this measure can report and their corresponding numeric values are discussed below:

Measure Value Numeric Value
No read ahead 1
Read ahead 2
Adaptive read ahead 3

Note:

By default, this measure reports one of the Measure Values listed above to indicate the read policy of the virtual disk. In the graph of this measure however, the same is represented using the numeric equivalents only.

Write policy

Indicates the write policy used by the controller to write data to this virtual disk.

 

The values that this measure can report and their corresponding numeric values are discussed below:

Measure Value Numeric Value
Write through 1
Write back 2
Write back force 3

Note:

By default, this measure reports one of the Measure Values listed above to indicate the write policy of the virtual disk. In the graph of this measure however, the same is represented using the numeric equivalents only.