🚀 go-pugleaf

On Sun, 30 Nov 1997 13:55:25 GMT, bob@lintilla.demon.co.uk (Bob
Cousins) wrote:

>In demon.tech.pc, Zypher wrote:
>
>>UltraDMA (the latest standard-forget EIDE also known as Ultra ATA or Ultra
>>33) can give a 33mb/sec transfer rate...but in real life its about
>>20mb/sec-not bad.
>>
>>If you want real speed-go with Ultrawide AV SCSI or higher like I have
>>(true 40mb/sec contionous, used for video capture, servers and the like)
>
>It's funny how people with SCSI systems often seek to put down EIDE, and at the
>same time make ridiculous performance claims for SCSI. Maybe its because they
>have paid twice as much for their disk storage, and feel a need to justify its
>cost, even if by inventing performance figures?
>
>If the Seagate Cheetah can do 14-21 MB/sec, I doubt you are seeing continuous
>40MB/sec. The fact is in a typical workstation, SCSI offers little or no benefit
>to the overall performance of the system. If you don't believe me, see
>http://www8.zdnet.com/pcmag/pclabs/report/r960702a.htm.

With a single HDD running a single app, sure EIDE is going to be the
same.  The difference is that SCSI is multithreading.  Where you see a
big performance boost is while multitasking, especially with multiple
drives, or a RAID controller.
If you only have one HDD you really don't care how wide the data path
is for anything but that cheetah.  Sustained transfer rates (which is
the only thing that counts on single drive systems) are only around
10mb/sec for most drives.

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