Compaq BL10e - HP ProLiant - 512 MB RAM Technology Overview
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Compaq BL10e - HP ProLiant - 512 MB RAM Technology Overview

Compaq BL10e - HP ProLiant - 512 MB RAM Technology Overview

Drive technology overview
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Download this manual See also: Troubleshooting Manual, Basic Manual
Drive technology overview
technology brief, 3
nd
Abstract.............................................................................................................................................. 2
Introduction......................................................................................................................................... 2
Categories of server disk drives ............................................................................................................. 2
Characteristics of disk drives ................................................................................................................. 3
Small form factor and large form factor disk drives .............................................................................. 3
Disk drive capacity........................................................................................................................... 4
Disk drive performance..................................................................................................................... 4
Reliability ........................................................................................................................................ 5
Drive qualification process.................................................................................................................... 6
Interconnect technology ........................................................................................................................ 7
Serial Attached SCSI (SAS) ............................................................................................................... 7
SAS-2 ............................................................................................................................................. 8
Second generation Serial ATA (SATA) ................................................................................................ 8
Interconnect bandwidths and drive throughput..................................................................................... 8
Improved performance and reliability with RAID ...................................................................................... 9
Advanced controllers ........................................................................................................................... 9
Solid state drives for servers.................................................................................................................. 9
HP solid state drive reliability requirements........................................................................................ 10
Value, mainstream and performance SSDs........................................................................................ 11
SSD performance ........................................................................................................................... 12
Conclusion........................................................................................................................................ 12
For more information.......................................................................................................................... 13
Call to action .................................................................................................................................... 13
edition
NAND over provisioning and wear-levelling.................................................................................. 10
Power loss protection .................................................................................................................. 10
1

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Summary of Contents for Compaq BL10e - HP ProLiant - 512 MB RAM

  • Page 1: Table Of Contents

    Drive technology overview technology brief, 3 edition Abstract.............................. 2 Introduction............................2 Categories of server disk drives ......................2 Characteristics of disk drives ......................... 3 Small form factor and large form factor disk drives ................3 Disk drive capacity........................... 4 Disk drive performance........................4 Reliability ............................

  • Page 2: Abstract

    Abstract Disk drive capacity has increased at rates similar to those of microprocessor performance. New and improved interconnect technologies allow the rapid transfer of large amounts of data to and from the disk. New and more cost-effective applications are made possible by increased storage capacity and reduced cost per bit.

  • Page 3: Characteristics Of Disk Drives

    HP Enterprise drives provide maximum reliability, highest performance, scalability, and error management under the most demanding conditions. They are the only class of drives designed for use at unconstrained I/O workloads and are intended for use in mission-critical applications such as large databases, e-mail servers, and CRM.

  • Page 4: Disk Drive Capacity

    and the reliability of these drives, combined with their lower power and smaller size, have hastened this transition. By the end of 2010, all new enterprise class drives and all new 10k and 15k RPM drives will be SFF. HP expects to continue to develop 3.5-inch midline and entry class drives. Disk drive capacity The capacity of a drive, measured in gigabytes, is set at manufacturing.

  • Page 5: Reliability

    Table 2. Strategies to improve single disk capacity, performance, and reliability Mechanical Magnetic Disk I/O Increase platter Increase bit density per Write cache buffer data to be written to disk rotation rate unit of track Increase areal Queue read operations density of data Reduce platter size Queue write operations...

  • Page 6: Drive Qualification Process

    Enterprise drives are designed for unlimited I/O workloads, that is, for continuous I/O activity. Midline and Entry drives are designed for low work I/O workloads. If any doubt exists about the expected workload, and if reliability is a priority, then Enterprise drives should be used. Drives are subject to mechanical problems created by shock, vibration, environmental extremes, and thermal effects.

  • Page 7: Interconnect Technology

    factory and at HP option kitting configuration sites. Product quality data is reviewed on a daily, weekly, and monthly basis. Interconnect technology Various interconnect technologies are used to connect one or more disk drives to a computer system. Technology has transitioned from parallel bus data interfaces (ATA, IDE, and the original SCSI interface) to SATA and SAS serial interfaces in which each drive has its own high-speed serial communication channel to the disk controller.

  • Page 8: Sas-2

    HP was instrumental in developing the SAS standard. For a more detailed discussion of SAS, see the HP technology brief entitled “Serial Attached SCSI technology” available at http://h20000.www2.hp.com/bc/docs/support/SupportManual/c01613420/c01613420.pdf. SAS-2 The SAS-2 interface supports a link speed of 6 Gb/s, or 600 MB/s, in each direction. SAS-2 controllers were first introduced with HP ProLiant G6 servers in 2009.

  • Page 9: Improved Performance And Reliability With Raid

    are connected to individual SAS-2 channels. In these cases, the performance limiter is the drive throughput, not the speed of the SAS links. The performance benefits of SAS-2 and its faster link speed becomes important when constructing SAS fabrics and larger drive arrays using SAS expanders that support the SAS-2 standard. With these configurations, the throughput of multiple drives is often aggregated across a single SAS-2 channel, thus taking full advantage of the additional SAS-2 bandwidth for increased overall performance.

  • Page 10: Hp Solid State Drive Reliability Requirements

    advances in flash memory as well as the rapidly evolving capabilities of NAND flash memory controllers, HP has been able to develop solid state drives that can meet the performance and reliability requirements for use in server environments. Figure 1. HP second generation solid state drive. Note: Shipping product may differ slightly in appearance HP solid state drive reliability requirements As with traditional disk drives, all SSDs are not the same.

  • Page 11: Value, Mainstream And Performance Ssds

    sustain a loss of power without requiring the lengthy metadata rebuild process required for SSDs that do not have this feature. Value, mainstream and performance SSDs As with spinning media, HP will introduce SSDs to meet the requirements of different application environments.

  • Page 12: Ssd Performance

     Limited airflow environments  Environments subject to higher shock and vibration (up to 1000G)  Environments requiring drives with lower power consumption (2 watts) HP SSDs are designed for an operational life of over three years, the typical service life for a new server.

  • Page 13: For More Information

    For more information For additional information, refer to the resources listed below. Resource description Web address Technology brief http://h20000.www2.hp.com/bc/docs/support/Support Serial ATA Technology Manual/c00301688/c00301688.pdf Technology brief http://h20000.www2.hp.com/bc/docs/support/Support Serial Attached SCSI storage Manual/c01613420/c01613420.pdf technology Technology brief http://h20000.www2.hp.com/bc/docs/support/SupportManu al/c01580706/c01580706.pdf Solid state drive technology for ProLiant servers HP Serial ATA Drives overview http://h18004.www1.hp.com/products/servers/proliants...

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