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Poor performance with SCSI vs IDE

 
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Ignacio Vazquez
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PostPosted: Wed Dec 17, 2003 2:47 pm    Post subject: Re: Poor performance with SCSI vs IDE Reply with quote



Avi wrote:

Quote:
The result of all my performance tests is as follows:

With what drives?

--
Cheers,
Ignacio

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Avi
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PostPosted: Wed Dec 17, 2003 3:27 pm    Post subject: Poor performance with SCSI vs IDE Reply with quote



Hi all,

I use Dual Xeon machine with 1GB Ram

SCSI 320 Ultra from Adaptec (and also tried LSI logic)

SQL Server 2000 sp 3a

Windows 2000 sp4

script with 33000 commands (about half of them inserts)

The result of all my performance tests is as follows:

· With the current configuration IDE disk give much better performance than
SCSI (40 seconds compared to 3.30 minutes)

· The faster the SCSI controller the slower the performance. In other words,
writing to the disk on old Motorola box was faster than the Dual CPU Xeon.

· SCSI 320 Ultra with RAID configuration gave good result (50 seconds).
(automatic disk catching?)

· If all the SQL commands are done in one transaction also the fast SCSI
(without RAID) finished in 30 seconds. However, this is not our regular
behavior and was done just to better understand our problem.

· Changing the SCSI controller (and drivers) did not improve performance.

· Benchmark utilities showed that the SCSI reads and writes are much faster
than their IDE counterpart.

· Both Sybase and SQL Server gave poor performance with SCSI

Is there something to configure that I'm missing

Avi



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