HP ProLiant DL585 G5/G6 server technology

available offline. The user must boot to the Smart Start CD and run ACU from there. Typically this

feature is used when testing out a software patch. The user could split the mirror as a means to save

the current data and then perform any type of destructive software update necessary, keeping the

resulting data set or reverting back to the old data. BBWC is not required for this feature to be

enabled.

Capacity expansion is the process of adding physical drives to the array that has already been

configured. The logical drives (or volumes) that exist in an array before the expansion takes place are

unchanged, only the amount of free space in the array changes. BBWC is required for this feature.

All Smart Array controllers use the same configuration utility and diagnostic software (Array

Configuration Utility (ACU)) and management software (HP Insight Manager). In addition, the SA-

P410 also provides Option ROM Configuration for Arrays (ORCA) that allows a simplified

configuration tool at the time of controller boot.

To view the HP QuickSpecs for this product, visit the HP web site:

http://

h18000.www1.hp.com/products/quickspecs/13201_div/13201_div.html

Serial Attached SCSI

Serial Attached SCSI (SAS) leverages a common electrical and physical connection interface with

Serial ATA (SATA), while offering logical SCSI compatibility along with SCSI reliability, performance

and manageability. SAS provides investment protection in compatible SCSI software and middleware

and the choice of direct-attach storage devices (SAS or SATA). In addition, greater performance,

longer cabling distances, smaller form factors and greater addressability will all lead to a new level of

flexibility when deploying mainstream data center servers and subsystems. This compatibility provides

users with many choices for server and storage subsystem deployment, by leveraging the SATA

development effort on smaller cable connectors, providing 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 provides 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. The preset configuration was selected

to provide greater safety for drive data in case of sudden power loss when there is no battery on the

controller to protect the cache. Enabling DWC may result in data loss if power is lost to the server and

there is no power protection configured for the server.

Native Command Queuing (NCQ) increases SATA HDD performance by internally prioritizing read

and write command execution. This reduces unnecessary drive head movement and results in

increased 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. NCQ must be supported and turned on in both the controller and the drive.

Please see the SATA Hard Drive QuickSpecs for specific SATA hard drive capacities that support

NCQ: http://

h18000.www1.hp.com/products/quickspecs/11940_div/11940_div.html.