Dell PowerVault MD3200i Owner's Manual - Page 34
RAID Controller Module-Additional Features, Battery Backup Unit, Storage Array Thermal Shutdown
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Item Component 18 Management port speed LED 19 Management port activity LED Function Lights green when ethernet connection is operating at 1000 Mbps. Lights amber when ethernet connection is operating at 100 Mbps. Off when ethernet connection is operating at 10 Mbps or is not active. Lights green when ethernet connection is active. Off when ethernet connection is not active. 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" on page 210. 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 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. Temperature threshold values determine the temperature at which shutdown occurs. These thresholds cannot be changed. 34 Planning: RAID Controller Modules