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Serial Attached SCSI
Serial Attached SCSI (SAS) leverages a common electrical and physical connection interface with Serial ATA
(SATA). It supports logical SCSI compatibility along with SCSI reliability, performance and manageability. SAS
provides investment protection in compatible SCSI software and middleware. It offers the choice of direct-attach
storage devices (SAS or SATA). In addition, SAS allows greater performance, longer cabling distances, smaller
form factors and greater addressability. All will lead to a new level of flexibility when deploying mainstream data
center servers and subsystems. This compatibility gives you many choices for server and storage subsystem
deployment, by leveraging the SATA development effort on smaller cable connectors. It gives customers a
downstream compatibility with desktop-class ATA technologies.
SAS and SATA Small Form Factor hard drives
The SAS architecture enables system designs that deploy high-performance SAS and high-capacity SATA Small
Form Factor (SFF) drives. This capability offers a broad range of storage solutions that give IT managers the
flexibility to choose storage devices based on reliability, performance, and cost.
SFF drives provide higher performance than large form factor drives. The smaller SFF platters reduce seek times
because the heads have a shorter distance to travel. RAID performance improves by increasing the numbers of
spindles.
HP ships SATA drives with Drive Write Cache (DWC) disabled. We selected the preset configuration to provide
greater safety for drive data in case of a sudden power loss when there is no battery on the controller to protect the
cache. Enabling DWC may result in data loss if power fails and there is no power protection.
Native Command Queuing (NCQ) increases SATA HDD performance by prioritizing read and write command
execution. This reduces unnecessary drive head movement and increases performance, especially in server or
storage-type applications with outstanding multiple simultaneous read/write requests. Without NCQ, the drive can
process and complete only one command at a time. You must activate NCQ in both the controller and the drive.
Networking technologies
The DL580 G7 includes the integrated NC375i network controller. The NC375i is a quad port Gigabit Server
Adapter that allows access to four 1 GbE ports. The NC375i has an eight lane (x8) PCI Express data path. With
four ports on a single integrated controller, this density design contributes to saving server I/O slots. It also makes
the configuration ideal for virtualization and security applications, server consolidation, and increased network
segmentation. The quad port NC375i meets the needs of customers wanting high bandwidth but are not yet ready
to move to 10 Gigabit Ethernet.
The NC375i supports the NC524SFP 10 GbE upgrade module, allowing two of the four ports to move to 10 GbE.
The NC524SFP module—with its theoretical maximum of 40 Gbps, dual port, bi-directional full duplex mode—
delivers optimum network performance designed to improve response time and remove bottlenecks. The NC375i
provides full driver support. The support includes teaming drivers for all major operating systems, along with
management utilities.
Network Adapter Teaming
ProLiant Network Adapter Teaming provides fault tolerance and load balancing across a team of two or more
network adapters. The team of adapters works together as a single virtual adapter. Support for several different
types of teaming is included. Teaming options offers an easy, efficient, and cost-effective way to provide network
fault tolerance and increased network bandwidth.