Dell PowerEdge R820 Technical Manual

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22 PowerEdge R820 Technical GuideExpress Flash drives use PCIe and SSD technologies to provide performance, scalability, and optimalserviceability. Accelerated performance with high IOPs is made possible without requiring processorresources or capturing DRAM. Also, Express Flash drives use a standardized 2.5-inch hot-plug formfactor that saves critical PCIe slot space by moving drives from the back to the front of the systemand allows a common management process for all drives.The PowerEdge R820 has an option to support up to four 2.5-inch, hot-plug Express Flash driveswith capacities of 175GB or 350GB.External storage for the R820 is available through optional HBAs for SAS, iSCSI, and Fibre Channel.For more information, see Dell.com/Storage.Dell provides highly capable RAID options for you to ensure that your data remains safe. Dell’s RAIDcontroller options offer impressive performance improvements, including the following features: FastPath™ I/O: This feature can help accelerate performance when operating on SSDs. Split mirror: This function allows you to break mirrored disk connection in order to quicklyreplace a drive. Physical disk power management (Dimmer Switch™): This feature allows for power control ofspare or idle drives, which can save energy and operating expenses.The newest line of PERC (PowerEdge RAID Controller) cards offer high I/O performance fordatabase applications and streaming digital media environments. The internal RAID controllers havea dedicated connection to the motherboard. The R820 supports the new PERC 8 family ofcontrollers with improved functionality and faster performance.The default PERC for the R820 is a mini-type PERC. However, for a system with an internal GPUcard or a card between half-length and ¾-length, use the adapter-type PERC. The R820 alsosupports the new software RAID solution that supports RAID 0, 1, 5 and 10. The R820 supports thePERC cards listed in Table 13. For more information about the latest PERC offerings, seeDell.com/PERC.Controller Description FeaturesRAIDmodessupportedForm factor UsagemodelPERC H810ExternalEight-port, external and6Gp/s PCIe RAID controllerIncludes 1GB NV DDR3cache, premiumperformance and featureset, security SED/EKMS,and SSD as cache0, 1, 10, 5,50, 6, 60 Adapter Premiumperformance