Lenovo ThinkServer RD240 MegaRAID SAS Software User Guide - Page 28
Solid State Drive Features
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• Eliminates the master-slave construction used in parallel ATA • Allows addressing of multiple SATA II targets through an expander • Allows multiple initiators to address a single target (in a fail-over configuration) through an expander 1.4 Solid State Drive Features MegaRAID firmware supports SSD drives attached to MegaRAID SAS controllers. These drives are expected to behave like SATA HDDs or SAS HDDs. The major advantages of SSD drives include: • High random read speed (because there is no read-write head to move) • High performance-to-power ratio, as these drives have very low power consumption compared to HDDs • Low latency • High mechanical reliability • Lower weight and size (for low-capacity SSD drives) The features and operations on SSD drives are the same as for hard disk drives (HDD). Note: MegaRAID implements support for only those SATA SSD drives which support ATA-8 ACS compliance. You can choose whether to allow a virtual drive to consist of both SSD devices and HDDs. For a virtual drive that consists of SSDs only, you can choose whether to allow SAS SSD drives and SATA SSD drives in that virtual drive. For virtual drives that have both SSDs and HDDs, you can choose whether to mix SAS and SATA HDD drives with SAS and SATA SSD devices in various combinations. Note: Support for SATA SDD drives applies only to those drives that support ATA-8 ACS compliance. 1.4.1 Solid State Drive Guard SSDs are known for their reliability and performance. SSD Guard™, a feature that is unique to MegaRAID, increases the reliability of SSDs by 1-4 Overview
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