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HP 418371-B21 - Dual Port 72 GB Hard Drive Technology Brief

Performance factors for hp proliant serial attached storage (sas)
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Performance factors for HP ProLiant
Serial Attached Storage (SAS)
technology brief
Abstract.............................................................................................................................................. 2
Introduction......................................................................................................................................... 2
HDD controller technologies .............................................................................................................. 2
HDD interface technologies ............................................................................................................... 3
Key HDD design parameters for enterprise environments ...................................................................... 3
SAS use for enterprise systems............................................................................................................... 4
HDD performance comparisons ............................................................................................................. 5
Performance comparison between SATA and SAS drives ...................................................................... 5
Performance comparisons between SAS drives .................................................................................... 8
SAS drive specifications ..................................................................................................................... 13
Conclusion........................................................................................................................................ 13
For more information.......................................................................................................................... 14
Call to action .................................................................................................................................... 14
Performance comparisons based on form factor ............................................................................... 8
Performance comparisons based on platter speed .......................................................................... 11

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  Summary of Contents for HP 418371-B21 - Dual Port 72 GB Hard Drive

  • Page 1: Table Of Contents

    Performance factors for HP ProLiant Serial Attached Storage (SAS) technology brief Abstract.............................. 2 Introduction............................2 HDD controller technologies ......................2 HDD interface technologies ....................... 3 Key HDD design parameters for enterprise environments ..............3 SAS use for enterprise systems....................... 4 HDD performance comparisons ......................
  • Page 2: Abstract

    Abstract Enterprise-class hard disk drives (HDD) must meet the maximum reliability and scalable performance goals of the 24/7 enterprise environment. Serial Attached SCSI (SAS) has become the defacto HDD standard for mission-critical applications. This paper explains the emergence of SAS and the key parameters of SAS drive technology.
  • Page 3: Hdd Interface Technologies

    HDD interface technologies Since the days of Advanced Technology Attachment (ATA, also known as Integrated Drive Electronics or IDE), the server industry has transitioned through several HDD interface technologies: • Small computer system interconnect (SCSI) • Serial Attached ATA (SATA) •...
  • Page 4: Sas Use For Enterprise Systems

    Another important factor to HDD performance is seek time, described as the time from when a read or write action is initiated until the data transfer from or to the disk actually begins. The smaller platters of SFF SAS drives inherently yield lower seek times, an advantage in file servers with frequent random accesses.
  • Page 5: Hdd Performance Comparisons

    HDD performance comparisons This section provides performance results of comparisons between HDD interface types, form factors, and platter speeds. Other factors such as operating system, application environment, controller type, RAID strategy, and general workload also play a part in system performance and should be considered when evaluating systems.
  • Page 6 Figure 2. Relative performance: random operations of non-NCQ SATA, NCQ SATA, and SAS 2-drive array with HP Smart Array Controller P400 Controller, RAID 1 Random Operations, RAID 1 (128 KB) IOMETER 07.30.2004 700% 600% 500% 400% 300% 200% 100% 4KB RANDOM READ 4KB RANDOM WRITE 4KB OLTP 8KB RANDOM READ...
  • Page 7 Figure 3. Throughput performance: random operations of non-NCQ SATA, NCQ SATA, and SAS 2-drive array with HP Smart Array P400 Controller, RAID 1 Random Opeations, RAID 1 (128 KB) IOMETER 07.30.2004 1000 4KB RANDOM READ 4KB RANDOM WRITE 4KB OLTP 8KB RANDOM READ 8KB RANDOM WRITE 8KB OLTP...
  • Page 8: Performance Comparisons Between Sas Drives

    Performance comparisons between SAS drives This section includes comparisons of SAS drives based on form factor and platter speed, along with differences in RAID strategies. Performance comparisons based on form factor Figures 4 through 8 compare the performance of SFF SAS drives and LFF SAS drives. The following configuration was used for testing the SAS drives: •...
  • Page 9 Figure 5. Performance comparison: SFF to LFF 15K 72-GB SAS drives with HP Smart Array P800 Controller, RAID 1 (128K) RAID-1 (128KB) IOMETER 07.30.2004 130% 120% 110% 100% 4KB RANDOM READ 4KB RANDOM WRITE 4KB OLTP 8KB RANDOM READ 8KB RANDOM WRITE 8KB OLTP 64KB RANDOM READ 64KB RANDOM WRITE...
  • Page 10 Figure 6 illustrates the IOPS performance of various array sizes of SFF SAS drives with the HP Smart Array P800 Controller using RAID 5 (64K). Figure 6. RAID5 performance of SFF 15K 72-GB SAS drive arrays SA-P800, RAID-5 (64KB) - SFF 15K IOMETER 07.30.2004 4500 4000...
  • Page 11: Performance Comparisons Based On Platter Speed

    Performance comparisons based on platter speed The charts in Figure 7 compare sequential read performance between 10K (rpm) and 15K SFF SAS drives operating as a 6-drive array with an HP Smart Array P800 controller using RAID 5. Charts 7A through 7E show the drive array performance for sequential reads per block size at a specific queue (Q) depth.
  • Page 12 Figure 8 compares the random read performance of 10K and 15K SFF SAS drives for arrays of three to eight drives, using RAID 5 with the block size set to 128 KB. Figure 8. Random read performance: 10K versus 15K RPM SFF SAS drives, RAID 5 4 KB Random Read 64 KB Random Read 512 KB Random Read...
  • Page 13: Sas Drive Specifications

    SAS drive specifications Table 3 compares the seek time and power consumption of SFF (2.5-inch) SAS drives available from HP at time of publication. NOTE: Drive types and specifications are subject to change without notice. Refer to the following site for a listing and specifications of currently available SAS drives: http://h18004.www1.hp.com/products/servers/proliantstorage/ serial/sas/index.html...
  • Page 14: For More Information

    Call to action Send comments about this paper to TechCom@HP.com. © 2008 Hewlett-Packard Development Company, L.P. The information contained herein is subject to change without notice. The only warranties for HP products and services are set forth in the express warranty statements accompanying such products and services.