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52 Using Your RAID Enclosure
Thermal Shutdown
Enclosure management provides a feature which automatically shuts down
the enclosure when the temperature within the RAID enclosure reaches
dangerous extremes. Thermal shutdown protects the data on the physical
disks from corruption in the event of a cooling system failure.
The temperature at which shutdown occurs is determined by the enclosure
temperature probe's Nominal Failure Threshold and the Maximum Failure
Threshold. These thresholds are default settings that cannot be changed. If
the temperature sensors on the backplane detect a temperature exceeding the
Nominal Failure Threshold, a critical event is set. If the Maximum Failure
Threshold is reached, shutdown of the enclosure power supplies occurs within
3 minutes. A third threshold, the Shutdown Threshold, shuts down the
enclosure power supplies within 5 seconds after it is reached.
NOTE: If an MD1000 expansion enclosure reaches critical internal temperatures,
the enclosure will be shut down automatically via a thermal shutdown command
issued by the EMM firmware.
Updating Enclosure Firmware
You can use MD Storage Manager to upgrade the firmware for the RAID
controller module, the controller NVSRAM, and the physical disks. In a
redundant configuration, the RAID controller module firmware can be
upgraded with no interruption to data access.
RAID Controller Module Firmware
The RAID controller module firmware and NVSRAM files are needed to
properly use MD Storage Manager and all of its features.
Before you download the RAID controller module firmware or NVSRAM files,
ensure that the multi-path driver (for example, MPP for Linux or MPIO for
Windows) is running on the host server. In a redundant configuration, the
multi-path driver maintains data access through one RAID controller module
while the other RAID controller module's firmware is upgraded. Also check
the MD Storage Manager to see if it lists both RAID controller modules as