RAID Status (EqualLogic) Check

The RAID Status (EqualLogic) Check monitors the state of the RAID controller for a Dell EqualLogic SAN.

Basic Check information

Check Type SNMP
Instances on a Device 100
Supported Systems/Applications Dell EqualLogic SANs that support the EQLMEMBER-MIB MIB.
Device Class Server - Windows, Server - Generic
RAID Array Enter the name of the RAID array to monitor. For a list of the available RAID arrays, query the SAN with the . SNMP OID.


Issue Corrective Action
Failed Please check that the correct SNMP community string is configured in Network Discovery for the device
201 Exception OID_TYPE_NOSUCHOBJECT Missing OID object on the device for specific metric


Metric Name OID/Calculation Description
RAID Status

The status of the RAID using a composite view of the underlying sub-systems with the status mapped to:

  1. OK - The RAID is operating normally.
  2. Degraded - The RAID is in a degraded state, possibly because no spares are available.
  3. Verifying - Running a verification pass and displaying a percentage complete value.
  4. Reconstructing - A drive is being reconstructed and displaying a percentage complete value.
  5. Failed - The RAID experienced a failure, possibly due to a failed drive with no spare being available.
  6. Catastrophic Loss - This may not be visible to the user since the RAID may not be able to start up. This means that administrator intervention is required to correct the problem.
  7. Expanding
  8. Mirroring - Indicates that a bad drive is being mirrored onto a spare drive.
RAID Capacity (%) (UsedStorage) (TotalStorage)

This value is expressed as a percentage and is calculated by dividing the UsedStorage value by the TotalStorage value and then multiplying the result by 100.
Are There Lost RAID Blocks To Be Cleared?

Specifies whether there are lost blocks in the RAID array which the user may want to clear. Mapped to:

  1. True
  2. False
Number Of Spares The number of disks allocated as spares in an array.
Number Of Controllers The number of controller modules in the array.
Number Of Disks The total number of disks that have been installed in the array.
Read/Write Cache Size The size in MB of the Read/Write cache within the array.
Read/Write Cache Mode

The mode that the Read/Write cache is currently in within the array. The default is Write-back however, the array will be configured to Write-thru whenever there is a battery failure. Mapped to:

  • 0 - Unknown
  • 1 - Write-thru
  • 2 - Write-back