Intel RS3DC040 Hardware User Guide - Page 17

Feature RS3WC080 User-specified rebuild rate (specifying the percentage Yes of system resources to use from 0 percent to 100 percent) Nonvolatile random access memory (NVRAM) of 32 Yes KB for storing RAID system configuration information; the MegaRAID SAS firmware is stored in flash ROM for easy upgrade. Full MegaRAID Software Stack No iMR Software Stack Yes RS3DC040 Yes Yes Yes No RS3DC080 Yes Yes Yes No SAS Features The 12Gb/s Intel® RAID Controllers support the following SAS features: • They provide four fully independent PHYs or eight fully independent PHYs, depending on the controller. • They support 12 Gb/s, 6Gb/s and 3Gb/s SAS data transfers per PHY. • They support SMP to communicate topology-management information. • They support SSP to enable communication with other SAS devices. • They support STP to enable communication with SATA devices through an attached expander. • They provide a serial, point-to-point, enterprise-level storage interface. • They simplify cabling between devices. • They provide a scalable interface that supports up to 240 devices through the use of expanders. Note: The number of devices varies depending on the Intel® RAID Controller product. Check the Intel website, http://www.intel.com, for specific details about your product. • They support wide ports that consist of two, three, or four PHYs within a single quad port. • They support narrow ports consisting of a single PHY. • They transfer data by using SCSI information units. SAS Array Limitations This section describes the array limitations of the 12Gb/s Intel® RAID Controllers. These limitations include the number of drives supported per controller, the maximum number of drives per controller, and the maximum number of virtual drives allowed per controller. The following table lists the array limitations for the 12Gb/s Intel® RAID Controllers. 12Gb/s Intel® RAID Controllers User Guide 7