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78 Troubleshooting Your Enclosure
Hard Controller Failures and Lockdown
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 Enclosure
The RAID controller module is supported only in a Dell-supported enclosure.
Upon installation in the enclosure, the controller performs a set of validation
checks. The enclosure 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 enclosure, the controller aborts startup. The RAID controller
module will not generate any events to alert you in the event of an invalid
enclosure, but the enclosure 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
Indicators and Features" on page 18.
ECC Errors
RAID controller firmware can detect ECC errors and can recover from a
single-bit ECC error whether the RAID controller module is in a redundant
or nonredundant 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 will failover if it experiences up to 10 single-bit
errors, or up to three multi-bit errors.