Talon ZL 4-150 SATA Controller from Pacific Digital :
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Talon ZL 4-150 SATA Controller from Pacific Digital

Date: 2004-12-30

[Abstract]
   We’re 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 Workstation Pattern

This pattern emulates a user who is intensively working in various applications in the NTFS5 file system:

Talon ZL 4-150 SATA Controller from Pacific Digital

The next diagram shows you the dependence of the array speed on the request queue depth:

Talon ZL 4-150 SATA Controller from Pacific Digital

The RAID0 arrays feature good scalability starting from a queue of four requests long. The RAID10 is faster than the two-disk RAID0 in every operational mode. The second mirroring array (RAID1) outperforms the single drive at short queues only. Its speed goes down suddenly at a queue of four requests, and it is behind the single drive since 16 requests.

The drive with disabled TCQ is slower than the rest of the arrays even on single requests.

We calculate the performance rating for the Workstation pattern by the following formula:

Performance Rating = Total I/O (queue=1)/1 + Total I/O (queue=2)/2 + Total I/O (queue=4)/4 + Total I/O (queue=8)/8 + Total I/O (queue=16)/16 + Total I/O (queue=32)/32

Talon ZL 4-150 SATA Controller from Pacific Digital

Since there’s a higher probability of short requests, the RAID1 array is faster than the single drive, while the big percentage of writes in this pattern leads to the drives lining up like they did in the File Server pattern.






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