Dell PowerVault MD3220 - Manual (Page 31)

Planning: RAID Controller Modules 31
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Planning: RAID Controller Modules
RAID Controller Modules
The RAID controller modules provide high-performance, advanced virtual
disk configuration, and fault-tolerant disk subsystem management. Each
RAID controller module contains 2 GB or 4 GB of mirrored cache for high
availability and is protected by a battery powered cache offload mechanism.
NOTE: The 4 GB mirrored cache is an optional feature.
RAID controller modules provide the following data path and enclosure
management functions:
• Monitoring and controlling enclosure environment elements
(temperature, fans, power supplies, and enclosure LEDs)
• Controlling access to the physical disks
• Communicating enclosure attributes and states to the host server and
management station
Each RAID controller module has multiple SAS IN ports for host access. The
ports provide redundant host connections and support a high availability
storage environment. Various configurations can be utilized, in both single
controller (simplex) and dual controller (duplex) modes, to connect the
storage enclosure to hosts depending on specific redundancy needs.
For information on cabling, see the MD3200 and MD3220 Series storage
array’s Deployment Guide at dell.com/support/manuals.
book.book Page 31 Tuesday, June 18, 2013 2:53 PM