Post #83,137
2/21/03 9:31:37 AM
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SCSI vs IDE
I found this over at slashdot.
[link|http://www.idg.net/go.cgi?id=787168|IDE]
The price difference 'tween SCSI and IDE is claimed to be from the testing each has to be put through.
Makes sense to me.
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Post #83,150
2/21/03 10:17:01 AM
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Nice...
But... wait I thought SCSI was always better...
FC even sect-seer... hmm maybe we've all been duped.
Oh well, we'll see. Soon I hope.
b4k4^2
| [link|mailto:curley95@attbi.com|greg] - Grand-Master Artist in IT | | [link|http://www.iwethey.org/ed_curry/|REMEMBER ED CURRY!] [link|http://pascal.rockford.com:8888/SSK@kQMsmc74S0Tw3KHQiRQmDem0gAIPAgM/edcurry/1//|ED'S GHOST SPEAKS!] | | [link|http://www.eweek.com/article2/0,3959,857673,00.asp|Writing on wall, Microsoft to develop apps for Linux by 2004] | Heimatland Geheime Staatspolizei reminds:
These [link|http://www.whitehouse.gov/pcipb/cyberspace_strategy.pdf|Civilian General Orders], please memorize them.
"Questions" will be asked at safety checkpoints. |
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Post #83,155
2/21/03 10:23:20 AM
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I thought the SCSI performance difference was CPU
Since the IDE controllers use some CPU, and the SCSI controllers do not.
Also, SCSI is supposed to be better for chained devices, isn't it?
I'm no expert, by any means... but this is how I recall it...
Regards,
-scott anderson
"Welcome to Rivendell, Mr. Anderson..."
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Post #83,157
2/21/03 10:38:03 AM
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Still would make sense.
Since the SCSI controller electronics are more complex, possibly that is where the enhanced testing requirement pops in, to verify all is working according to plan?
"Computer games don't affect kids; I mean if Pac-Man affected us as kids, we'd all be running around in darkened rooms, munching magic pills and listening to repetitive electronic music." -- Kristian Wilson, Nintendo, Inc, 1989
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Post #83,160
2/21/03 10:44:10 AM
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Serial ATA... may have broke that assumption...
Serial ATA, supposedly you can chain upto 61??? or was it 29?? devices per serial ATA chain...
And, I once thought that too... but now it seems most of the chipsets are doing the work... older chipset may experience those problem... but the PDC and HPT chipsets seem to be doing most of the work...
Now, I can burn-up processor just as much with SCSI as I can with IDE... If you look at those chipsets anyway... they are addressed as SCSI now anyhow. (At least in Windoze... :~O)
b4k4^2
| [link|mailto:curley95@attbi.com|greg] - Grand-Master Artist in IT | | [link|http://www.iwethey.org/ed_curry/|REMEMBER ED CURRY!] [link|http://pascal.rockford.com:8888/SSK@kQMsmc74S0Tw3KHQiRQmDem0gAIPAgM/edcurry/1//|ED'S GHOST SPEAKS!] | | [link|http://www.eweek.com/article2/0,3959,857673,00.asp|Writing on wall, Microsoft to develop apps for Linux by 2004] | Heimatland Geheime Staatspolizei reminds:
These [link|http://www.whitehouse.gov/pcipb/cyberspace_strategy.pdf|Civilian General Orders], please memorize them.
"Questions" will be asked at safety checkpoints. |
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Post #83,315
2/21/03 9:49:03 PM
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Re: I thought the SCSI performance difference was CPU
Yep. Years ago, I wrote what was in a effect a SCSI device driver on a roll your own embedded system. This was on a [link|http://www.webopedia.com/TERM/V/VME_bus.html|VME bus] system, but the SCSI controller as well as the hard drives themselves are much more capable. For example, it is possible to tell a drive to low level format itself with some uncommon sector size and cause interrupt when it was done. It was possible to queue up a whole bunch of non-contiguous sector reads to a drive and get a single interrupt when it was done. It was possible to have 7 drives doing I/O simultaneously.
I don't know how fancy the PC SCSI controller are, but I would expect them to be similar in capability.
Alex
"No man's life, liberty, or property are safe while the legislature is in session."\t-- Mark Twain
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Post #83,319
2/21/03 9:58:49 PM
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I know scsi is small computer serial interface
I forget what ATA and IDE refer to. I suspect the difference is in signal handling accross the bus in a chain. I know that the difference between a scsi at $200 and an IDE at $160 as described in the article would not be enough of a difference for me to buy an IDE for a server. SCSI I have found over the years to be less problematic. (once you set them up correctly.)
thanx,
bill
will work for cash and other incentives [link|http://home.tampabay.rr.com/boxley/resume/Resume.html|skill set]
questions, help? [link|mailto:pappas@catholic.org|email pappas at catholic.org]
\ufffdOmni Gaul Delenda est!\ufffd Ceasar
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Post #83,324
2/21/03 10:17:05 PM
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Well, SCSI is . .
Small Computer System Interface (not serial). IDE is Integrated Drive Electronics, ATA is AT Attachment.
[link|http://www.aaxnet.com|AAx]
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Post #83,331
2/21/03 10:42:08 PM
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my oldtimers disease thanx you :-)
will work for cash and other incentives [link|http://home.tampabay.rr.com/boxley/resume/Resume.html|skill set]
questions, help? [link|mailto:pappas@catholic.org|email pappas at catholic.org]
\ufffdOmni Gaul Delenda est!\ufffd Ceasar
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Post #83,691
2/24/03 9:13:44 AM
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Originally SCSI = Shugart Computer System Interface
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