Item Component Function
NOTE: The password reset switch is not
available if your system was shipped after
September, 2015. The password reset switch
functionality was disabled starting from
controller firmware 08.20.09.60 and later
versions.
14 SAS OUT port (2) Provides SAS connection for cabling to a downchain
expansion enclosure.
Host Channel LED Link Rate Indications
Below each FC port is a pair of LED indicators. The status of any FC port can be determined by applying
the following table to the condition of each LED pair.
Table 5. Host Channel LED Link Rate Indications
LED 1 LED 0 CommRate
Off Off Link down
Off On 2 Gbps
On Off 4 Gbps
On On 8 Gbps
RAID Controller Module—Additional Features
Battery Backup Unit
Each RAID controller contains a two-cell Lithium ion nanopolymer battery backup unit (BBU). It provides
power to the RAID controller module in the event of a power outage. For information on removing and
installing the BBU, see RAID Controller Module Backup Battery Unit .
NOTE: For virtual disks, the RAID controller firmware changes the data cache setting based on the
state of the battery. If the battery is missing or does not have sufficient charge, the controller flushes
the cache and sets the write cache attribute to Write Through for all virtual disks. When the battery
is replaced, Write Back is re-enabled.
Storage Array Thermal Shutdown
The system automatically shuts down when system temperature exceeds the safe threshold. The battery
backup unit protects against data loss by providing power to offload cache to non-volatile memory in the
event of power loss. It is not necessary to shut down any MD1200 Series expansion enclosures attached
to the storage array when thermal shutdown occurs.
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