HP 273914-B21 HP Smart Array Controller technology, 3rd edition - Page 24

Storage support and pathway redundancy HP Smart Array controllers support solid state drives, Native Command Queuing and Dual Domain providing increased performance and redundancy on the storage network. Smart Array controllers continue to support tape back up devices. Solid state drives HP has introduced the second generation of solid state drives (SSD) for ProLiant servers. These solid state drives are 3Gb/second SATA interface in both 60GB and 120GB capacities. The product, based on NAND Single Level Cell flash technology, are implemented as SFF and LFF hot plug devices on the HP universal drive carrier for general use across the ProLiant portfolio. These drives deliver higher performance, lower latency, and low power solutions when compared with traditional rotating media. These HP second generation SSDs are supported for use with the present generation Smart Array controllers based on the PM8011 SRC MIPS processor on select ProLiant G6 servers. Native Command Queuing Native Command Queuing (NCQ) increases SATA HDD performance by internally prioritizing read/write command execution. This reduces unnecessary drive head movement which results in increased performance, especially in server or storage-type applications where multiple simultaneous read/write requests are common. Without NCQ, the drive can process and complete only one command at a time. NCQ must be supported in both the controller and the drive. NOTE: For more information about NCQ support on Smart Array controllers, see Support Communication - Customer Notice, Document ID: c01800086, Version: 1 athttp://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c01 800086&lang=en&cc=us&taskId=101&prodSeriesId=428936 Dual Domain support Dual Domain SAS creates redundant pathways from servers to storage devices. These redundant paths reduce or eliminate single points of failure within the storage network and increase data availability. Dual domain SAS implementations can tolerate host bus adapter (HBA) failure, external cable failure, expander failure, or failure in a spanned disk (JBOD). Dual Domain support is available for the HP Smart Array P800 attached to an MSA60/70 with the HP StorageWorks Dual Domain I/O Module Option (AG779A). Dual Domain support requires HP Smart Array firmware v5.10 or higher and dual-port SAS drives. Dual Domain supports Multi-Initiator JBOD Clusters. I/O Module Option with the HP SC44Ge Host Bus Adapter supports HP-UX and OpenVMS on select HP Integrity servers only. Dual Domain is also supported by HP Serviceguard software on HP-UX with HP-UX 11iv2 and 11iv3 only. 24