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Troubleshooting: Your Array 271
Troubleshooting RAID Controller Modules
Conditions
Certain events can cause a RAID controller module to fail and/or shut down.
Unrecoverable ECC memory or PCI errors, or critical physical conditions can
cause lockdown. If your RAID storage array is configured for redundant access
and cache mirroring, the surviving controller can normally recover without
data loss or shutdown.
Typical hard controller failures are detailed in the following sections.
Invalid Storage Array
The RAID controller module is supported only in a Dell-supported storage
array. Upon installation in the storage array, the controller performs a set of
validation checks. The array status LED is lit with a steady amber color while
the RAID controller module completes these initial tests and the controllers
are booted successfully. If the RAID controller module detects a non-Dell
supported storage array, the controller aborts startup. The RAID controller
module does not generate any events to alert you in the event of an invalid
array, but the array status LED is lit with a flashing amber color to indicate a
fault state.
For full details on the LEDs and their interpretation, see "Back-Panel Features
and Indicators" on page 27.
ECC Errors
RAID controller firmware can detect ECC errors and can recover from a
single-bit ECC error irrespective of the RAID controller module
configuration. A storage array with redundant controllers can recover from
multi-bit ECC errors as well because the peer RAID controller module can
take over, if necessary.
The RAID controller module failsover if it experiences up to 10 single-bit
errors, or up to three multi-bit errors.
book.book Page 271 Thursday, December 9, 2010 3:20 PM