manualshive.com logo in svg

HP 418371-B21 - Dual Port 72 GB Hard Drive, Техническое описание, Страница: 13 / 14

Поделиться
Скачать
HP 418371-B21 - Dual Port 72 GB Hard Drive Скачать руководство пользователя страница 13

 

13 

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

  

Table 3. 

Comparison of seek time and power consumption of HP SFF SAS drives

 

Capacity/RPM 

36 GB/15K 

72 GB/10K 

72 GB/15K 

146 GB/10K 

Seek time: 
   Single track 
   Average 
   Full stroke 

 

0.20 ms 

3.0 ms 
7.0 ms 

 

0.20 ms 

4.0 ms 
8.1 ms 

 

0.20 ms 

3.0 ms 
7.0 ms 

 

0.60 ms 

4.1 ms 
8.0 ms 

Power consumption: 
   Idle 
   Maximum 

 

5.74 watts 
7.25 watts 

 

5.96 watts 
8.42 watts 

 

6.11 watts 
8.29 watts 

 

6.31 watts 
8.73 watts 

NOTE: All drives listed In Table 3 have a cache/buffer size of 16 MB and a transfer time of 3 Gb/s. 

 

Conclusion 

A variety of hard drive types are used in today’s server industry. The right HDD type is the one that 

provides the best return on investment (ROI) for a particular server application. Small-to-medium 

businesses (SMBs) or environments with less-than-demanding applications can be well served with 

SCSI or SATA drives that offer economical service and good dollar-per-gigabyte value. 
In the mission-critical, performance-oriented, enterprise server environment where hard drive duty 

cycle is 100 percent, SFF SAS drives excel in performance and reliability. Since SFF drives require 

only 70 percent of the space and half the power of 3.5-inch drives, higher drive densities per U 

space can be achieved 

without

 a significant increase in power consumption. Higher drive densities 

provide better overall performance, reliability, and lower operating costs. 

Содержание 418371-B21 - Dual Port 72 GB Hard Drive

Страница 1: ...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 Performance comparisons based on form factor 8 Performance comparisons based on platter speed 11 SAS drive specifications 13 Conclusion 13 For more information 14 Call to action 14 ...

Страница 2: ...and Queuing NCQ allow controllers and compatible HDDs to take advantage of the read write head position for more efficient drive operations RAID is another logic based solution that places data in stripes across multiple drives to enhance reliability performance and data integrity A variety of RAID strategies1 are in use RAID 0 Striping to two or more disks no parity for performance improvement no...

Страница 3: ...Key HDD design parameters for enterprise environments Enterprise class HDDs must provide maximum performance under a 100 percent duty cycle and continuous I O workload in a high vibration environment While Mean Time Before Failure MTBF is used to express the length of HDD life in general a more meaningful benchmark the Annual Failure Rate AFR better defines the estimated life of an HDD in the ente...

Страница 4: ...percent higher Input output Operations Per Second IOPS 30 percent smaller physical size Up to half the power consumption Increasing HDD density in a RAID based system invariably enhances the overall performance of the storage system Increasing the drive density also expands the choice of RAID strategies as indicated in Table 2 Table 2 Comparison of drive support in two 1U HP ProLiant servers Serve...

Страница 5: ...drives using the following configuration System HP StorageWorks 60 Modular Smart Array SAS Controller HP Smart Array P400 firmware version 4 12 512 MB cache RAID 1 Figure 1 Relative performance sequential operations of non NCQ SATA NCQ SATA and SAS 2 drive array with HP Smart Array P400 Controller RAID 1 Sequential Operations RAID 1 128 KB 0 100 200 300 400 500 600 700 800 900 1000 1 2 4 8 16 32 6...

Страница 6: ...ANDOM READ 8KB RANDOM WRITE 8KB OLTP 64KB RANDOM READ 64KB RANDOM WRITE RELATIVE PERFORMANCE IOMETER 07 30 2004 SATA Non NCQ 60 GB 5 4K 25 75 R W cache baseline performance level SATA NCQ 120 GB 5 4K 25 75 R W cache SAS 72 GB 15K 25 75 R W cache The HP P400 controller supports NCQ so the NCQ SATA drives provide an increase in performance over non NCQ SATA drives The SAS arrays however are much fas...

Страница 7: ...6 1 2 4 8 16 32 64 128 256 1 2 4 8 16 32 64 128 256 1 2 4 8 16 32 64 128 256 1 2 4 8 16 32 64 128 256 1 2 4 8 16 32 64 128 256 1 2 4 8 16 32 64 128 256 1 2 4 8 16 32 64 128 256 4KB RANDOM READ 4KB RANDOM WRITE 4KB OLTP 8KB RANDOM READ 8KB RANDOM WRITE 8KB OLTP 64KB RANDOM READ 64KB RANDOM WRITE THROUGHPUT IOPS IOMETER 07 30 2004 SATA Non NCQ 60 GB 5 4K 25 75 R W cache SATA NCQ 120 GB 5 4K 25 75 R ...

Страница 8: ...ntroller RAID 0 128K RAID 0 128KB 70 80 90 100 110 120 130 1 2 4 8 16 32 64 128 256 1 2 4 8 16 32 64 128 256 1 2 4 8 16 32 64 128 256 1 2 4 8 16 32 64 128 256 1 2 4 8 16 32 64 128 256 1 2 4 8 16 32 64 128 256 1 2 4 8 16 32 64 128 256 1 2 4 8 16 32 64 128 256 4KB RANDOM READ 4KB RANDOM WRITE 4KB OLTP 8KB RANDOM READ 8KB RANDOM WRITE 8KB OLTP 64KB RANDOM READ 64KB RANDOM WRITE Diff SFF 15K Performan...

Страница 9: ...6 32 64 128 256 4KB RANDOM READ 4KB RANDOM WRITE 4KB OLTP 8KB RANDOM READ 8KB RANDOM WRITE 8KB OLTP 64KB RANDOM READ 64KB RANDOM WRITE Diff SFF 15K Performance compared to LFF 15K IOMETER 07 30 2004 Level of performance for LFF SAS drives 2 SFF SAS drives 4 SFF SAS rives 6 SFF SAS drives 8 SFF SAS drives 12 SFF SAS drives RAID 1 is a strategy for achieving redundancy rather than enhanced performan...

Страница 10: ... 3000 3500 4000 4500 1 2 4 8 16 32 64 128 256 1 2 4 8 16 32 64 128 256 1 2 4 8 16 32 64 128 256 1 2 4 8 16 32 64 128 256 1 2 4 8 16 32 64 128 256 1 2 4 8 16 32 64 128 256 1 2 4 8 16 32 64 128 256 1 2 4 8 16 32 64 128 256 4KB RANDOM READ 4KB RANDOM WRITE 4KB OLTP 8KB RANDOM READ 8KB RANDOM WRITE 8KB OLTP 64KB RANDOM READ 64KB RANDOM WRITE THROUGHPUT IO Per Second IOMETER 07 30 2004 4 SFF SAS drives...

Страница 11: ...ise server environment a large number of users generating requests can result in a queue depth of tens or hundreds Chart 7F shows random read IOPS performance Figure 7 Performance comparison 10K versus 15K RPM RAID 5 controller and 6 SFF SAS drives A Sequential read Q1 B Sequential read Q4 C Sequential read Q8 D Sequential read Q16 E Sequential read Q32 F Random IOPS 10K RPM SAS HDD 15K RPM SAS HD...

Страница 12: ...er random read IOPS than 10K drive arrays Also overall performance scales with array size number of drives Note that performance is best when retrieving data blocks that are larger than the RAID 5 stripe size 128 KB in this case For optimum performance the stripe size should be configured for the specific application 2500 2000 1500 1000 500 IOPS No of drives 10K HDD P400 controller 15K HDD 6402 co...

Страница 13: ...atts 8 73 watts NOTE All drives listed In Table 3 have a cache buffer size of 16 MB and a transfer time of 3 Gb s Conclusion A variety of hard drive types are used in today s server industry The right HDD type is the one that provides the best return on investment ROI for a particular server application Small to medium businesses SMBs or environments with less than demanding applications can be we...

Страница 14: ...ief http h20000 www2 hp com bc docs support SupportManual c0 0302340 c00302340 pdf 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 N...

Отзывы:

Нет отзывов