Dell PowerVault MD3000 - Manual (Page 100)

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Maintaining a Storage Array
The test results contain a generic, overall status message and a set of specific
test results. Each test result contains the following information:
• Test (read/write/data loopback)
• Port (read/write)
• Level (internal/external)
• Status (pass/fail)
Events are written to the MEL when diagnostics are started and when testing
is completed. These events help you to evaluate whether diagnostics testing
was successful or failed and the reason for the failure.
Recovery Operations
Recovery operations involve replacing failed RAID controller modules and
physical disks, restoring data, and restoring the storage array to operation.
Setting RAID Controller Module Operational Mode
A RAID controller module has three operational modes:
• Online
• Offline
• Service
NOTICE:
Placing a RAID controller module offline can cause loss of data.
Placing a RAID controller module online sets it to the Optimal state and
makes it active and available for I/O operations. Placing a RAID controller
module offline makes it unavailable for I/O operations and moves its disk
groups to the other RAID controller module if failover protection is enabled.
Taking a RAID controller module offline can seriously impact data integrity
and storage array operation.
If you take a RAID controller module offline, the second RAID controller
module in the pair takes over. Disk groups and their associated virtual disks
that were assigned to the offline RAID controller module are automatically
reassigned to the remaining RAID controller module.
NOTICE:
Place a RAID controller module in Service mode only under the direction
of Technical Support.