Talon ZL 4-150 SATA Controller from Pacific Digital :
  TheThirdMedia HardwareStorage GuideStorage Article > Talon ZL 4-150 SATA Controller from Pacific Digital

Talon ZL 4-150 SATA Controller from Pacific Digital

Date: 2004-12-30

   Weíre returning once again to the Raptor 2 drive from Western Digital and its relationships with Tagged Command Queuing (TCQ). The reason for our stirring up the dying fire searching for burnin...

[Content] PCDigitalMobileGame

Intel IOMeter Database Pattern

The controller is processing a stream of requests to read and write 8KB random-address data blocks. Changing the ratio of reads to writes in the stream we can determine how well the controllerís driver is sorting the requests out.

The results of this pattern follow below:

Talon ZL 4-150 SATA Controller from Pacific Digital

The following diagrams show the dependence of the data-transfer speed on the percentage of writes for different requests queue lengths. Since the number of supported RAID arrays is rather limited, we will divide the diagrams by different queue lengths only.

Talon ZL 4-150 SATA Controller from Pacific Digital

The arrays have the same speeds in the Random Read mode under a linear load, but as soon as there appear write requests the lazy write and the type of the array begin to influence its speed noticeably. The number of drives in the RAID0 array only affects its speed at high percentages of writes.

The RAID0 array is slower than the single drive when the number of write requests is above 50 percent. The RAID10 behaves oppositely to what we see with the two-disk RAID0. Itís hard to identify the effect of mirroring under this load.

As for the effect from Tagged Command Queuing, it is negative. Why? TCQ is bad under a linear load as some time is spent to process the requests, but this processing brings no particular advantages. This is compensated by the drives?lazy writing algorithms at high percentages of writes, but otherwise the single drive with enabled TCQ is slower than the same single drive without TCQ, as you can clearly see.

[ Remark ] [ Print ] [ Font: Large Standard Small ]

Last News: Seagate External 200GB Hard Disk Drive Review
Next News: Asus DRW-1604P Review (German)

Search News

Class Title
Home Page (0)
CPU Guide (959)
Chipset Guide (193)
Memory Guide (472)
Mainboard Guide (464)
Video Guide (1339)
Storage Guide (410)
Storage News (283)
Storage Article (127)
Multimedia Guide (736)
Mobile Guide (492)
Other HD Guide (2471)
Hot News
      >> Remark List   [Total 3 Remarks]
    Post Remark

    Remark: Letters0

      >> Related News      
     New ATI Certification Program Streamlines Process for Game Developers  (2005-03-02)
     ATI Certification Program Streamlines Process for Game Developer  (2005-02-26)
     High-End CPU Coolers Roundup: The Battle for Silence and Efficiency  (2005-02-25)
     HP Searches for New Chief Executive Officer  (2005-02-12)
     Spansion Achieves Rigorous ISO/TS 16949:2002 Automotive Quality Management Sy...  (2005-02-03)
     FIC Vassili Personal Media Player Showcases Capabilities of AMD Alchemy(tm) A...  (2005-01-06)
     XGI Volari XP5 Graphics Chipsets Officially Launched in the Market by Combina...  (2005-01-06)