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Dissipating SCSI???????

Posted on 2003-11-08
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Last Modified: 2013-11-14
I don't know why, but I have always held this facination for "SCSI" or "Small Computer System Interface"

Even before I actually knew what it did, I had this curiousity towards it. In computer tech. class we are studying the mighty SCSI interface with all of it's capabilities. One of my class-mates pointed out that SCSI is on the way out. This filled me with sadness because of my peculier love for the thing and, I don't even have one.

I've been getting a lot of my study material from the books that I have purchased and been pouring over, it's difficult to absorb so much information, but I have gathered from "Scott Mueller's, Upgrading and Repairing PCs, 15th anniversary edition" that the SCSI is mightier than I or my classmate realized.

Scott says that it can support up to 15 devices and, when you consider that most systems can support up to 4 host adapters, each with up to 15 devices, for a total of 60 and that there are even dual channel adapters that can double that figure, that's pretty impressive.
Then there's speed. The latest "Ultra 4", (Ultra 320) SCSI version supports transfer speeds of up to 320 MBps and, an even fast version is being developed, called "Ultra 5", (Ultra 640), which will transfer at 640 MBps. By comparison, parallel ATA aka IDE transfers at speeds up to 133 MBps, whereas the new serial ATA transfers at 150MBps.

My question is this. Is SCSI really on the way out or is it on the way up?

Thanks in advance,   chesgems
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Question by:chesgems
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dbrunton earned 250 total points
ID: 9707774
>>> Is SCSI really on the way out or is it on the way up?

Nope.

The ATA speeds you quote are maximum burst speeds, something that doesn't happen often.  As a rough rule expect to only see half of that speed in normal use.

Biggest advantage of SCSI is that it takes the load of the processor, and gives it to the SCSI card.

SATA is the biggest threat to SCSI because it also takes the load of the processor but I understand the SCSI people are looking at this and going to incorportate SATA into SCSI in some manner.
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by:dbrunton
ID: 9707781
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by:bridgel
ID: 9710243
scsi rules!!!!
yeh!!!!
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Expert Comment

by:KrelianX
ID: 9723992
It seems to me that your classmate is one of those self proclaimed know it alls. In any big(er) business SCSI is worth its weight in gold. Its fast and easy to adapt to. Look at the ATA vs. SCSI harddrive speeds your "fast" ATA drives can only spin at 7200 where as SCSI HDs spin at 10,000 15,000 rpm drasticlly reducing seek time. So until SATA can put up some huge numbers for HD spin, SCSI is going to be around. Thats only one benifit. VIVA LA SCSI! I only wish I had the money myself to play around with it. :(
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Expert Comment

by:KrelianX
ID: 9723993
It seems to me that your classmate is one of those self proclaimed know it alls. In any big(er) business SCSI is worth its weight in gold. Its fast and easy to adapt to. Look at the ATA vs. SCSI harddrive speeds your "fast" ATA drives can only spin at 7200 where as SCSI HDs spin at 10,000 15,000 rpm drasticlly reducing seek time. So until SATA can put up some huge numbers for HD spin, SCSI is going to be around. Thats only one benifit. VIVA LA SCSI! I only wish I had the money myself to play around with it. :(
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by:chesgems
ID: 9724640
I love you guy's.

Your all just wonderful.

chesgems  ;-)
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