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Re: FastSCSI on WarpEngine

On Tue, Mar 04, 2003 at 07:52:21PM +0100, Kars de Jong wrote:

> I have a Blizzard 1260 with a 68060 @ 50 MHz here, and doing a quick
> 'hdparm -T' (to test buffer-cache reads) gives me the following results:
> /dev/hda:
>  Timing buffer-cache reads:   128 MB in  9.68 seconds = 13.22 MB/sec

Hmmm, well, hdparm is not really my favorite to test disk speed (or anything
else ;)).

 Timing buffer-cache reads:   128 MB in 20.96 seconds =  6.11 MB/sec
 Timing buffered disk reads:  64 MB in 42.71 seconds =  1.50 MB/sec

This is on a heavy busy 040/40... the autobuilder is running and the load
was 3, dpkg was running in the background... 

> /dev/sdb:
>  Timing buffered disk reads:  64 MB in 16.41 seconds =  3.90 MB/sec
> This is a 7200 RPM Seagate Baracuda ST32550W disk on the same controller
> with the same settings.

Yeah, that would be nice to have... 

> Summarising: I don't think you'll ever get 4-6 MB/s with a single disk.
> You don't even fill up the 5 MHz bandwidth currently it seems, so I
> don't think it will get much better.

No, not 4-6 MB/s out of a single disk but from a two disk raid0. 
> Of course, I don't know how good or bad the Blizzard 1260 design is, I
> heard that its memory bus is clocked really slow (25 MHz?) (that might
> include the SCSI controller).

The WarpEngine is known to be an excellent design.

Ciao...              // 
      Ingo         \X/

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