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]
   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 Sequential Read and Write Patterns

Letís watch the controller doing sequential reading and writing.

IOMeter is sending a stream of read/write requests with a 4-request-long queue. Every minute the size of the data block changes so that we could get the dependence of the linear read/write speed on the data block size:

Talon ZL 4-150 SATA Controller from Pacific Digital

The following diagram shows the dependence of the controllerís read speed on the size of the data block.

Talon ZL 4-150 SATA Controller from Pacific Digital

We thought RAID arrays comprised of a different number of drives (especially RAID0 arrays) would have different read speeds, but?There are two distinct groups: 1) the RAID1 and the two JBOD arrays with TCQ on and off and 2) the two-, four-disk RAID0 arrays and the RAID10. We canít really say why the arrays behave as they do. :) Numbers like 60 or 77MB/s canít be related to the read speed of the single drive (it is somewhere around 68MB/s) or to the limitations of the PCI bus.

One thing is certain, though. We canít see any profit from TCQ here at all.

Next goes sequential writing; hereís the table:

Talon ZL 4-150 SATA Controller from Pacific Digital

We construct a diagram like with sequential reading.

Talon ZL 4-150 SATA Controller from Pacific Digital

We see the graphs of the single drive with enabled and disabled TCQ fully coincide, but the rest of the graphs are simply awful.

First, all the drives are slower than the single drive starting from 4KB data blocks. Second, the speeds of the RAID0 arrays are similar, and the two-disk array is often faster than the four-disk one. Third, the performance of the mirroring arrays (RAID1 and RAID10) is terrible.

Overall, the Talon ZL4-150 doesnít have the best possible results in synthetic patterns. Letís see what it has to show us in patterns that imitate real-life workloads.






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