Dell PowerVault MD3200 Owner's Manual - Page 29
Planning: RAID Controller Modules, RAID Controller Modules - sas storage array
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3 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 of cache that is mirrored with the other controller's cache for high availability and is protected by a batterypowered cache offload mechanism. 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. Planning: RAID Controller Modules 29