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asus p2b-ds and scsi (from a scsi newbie)
Ok, time to get my SCSI-ness together. I've been an IDE person since
I can remember. This would be the first board I've owned with SCSI capabilities. The board appears to have two scsi connectors, one for 50 pin and the other 68 pin. I've got lots of 50pin scsi connectors lying about the house from some purchas or other I made on E-bay. Is one option (50 vs 68 pin) better than another? Is there a difference other than the obvious, the pin count? I have noticed that there are all sorts of SCSI drives, connectors and adaptors. What are the differences between them? Do I need to know anything special about the cables? Would a 7200RPM scsi drive run faster (to make a real difference) than an ATA100 7200RPM IDE drive? Is it the 40Mhz bus which makes the difference? How would I go about buying a SCSI drive that would go with this board? Meaning: are there any special characteristics the drive must have to work with this board? Are there some SCSI drives which would not work with this board? Or perhaps they would with the right PCI SCSI controller card? lots of questions. If you know of a good teaching link, maybe that'll suffice. thanks in advance |
#2
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http://www.granitedigital.com/home/s...leshooting.htm
wrote in message news Ok, time to get my SCSI-ness together. I've been an IDE person since I can remember. This would be the first board I've owned with SCSI capabilities. The board appears to have two scsi connectors, one for 50 pin and the other 68 pin. I've got lots of 50pin scsi connectors lying about the house from some purchas or other I made on E-bay. Is one option (50 vs 68 pin) better than another? Is there a difference other than the obvious, the pin count? I have noticed that there are all sorts of SCSI drives, connectors and adaptors. What are the differences between them? Do I need to know anything special about the cables? Would a 7200RPM scsi drive run faster (to make a real difference) than an ATA100 7200RPM IDE drive? Is it the 40Mhz bus which makes the difference? How would I go about buying a SCSI drive that would go with this board? Meaning: are there any special characteristics the drive must have to work with this board? Are there some SCSI drives which would not work with this board? Or perhaps they would with the right PCI SCSI controller card? lots of questions. If you know of a good teaching link, maybe that'll suffice. thanks in advance |
#4
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On Sat, 08 May 2004 14:36:59 +0200, in alt.comp.periphs.mainboard.asus,
Stephan Grossklass wrote: schrieb: [snip] Is one option (50 vs 68 pin) better than another? [snip] It's not so much "better or worse" as it is "horses for courses". Different devices will be better-suited for one variant or the other. The thing to remember is that SCSI is *not* just a HDD interface. It is a general-purpose peripheral bus. Stephan has given you some good starter info; I only have a few minor quibbles... The 50-pin connector is intended for Narrow SCSI devices up to Ultra (Narrow) in SE mode. (Mainly opticals and such.) [snip] And many tape drives, and (at least older and/or more "serious") scanners, and a bunch of other stuff. Would a 7200RPM scsi drive run faster (to make a real difference) than an ATA100 7200RPM IDE drive? No, in the contrary it would be slower, at least for desktop tasks! Compare the performance of the Seagate Barracuda ATA IV and the Barracuda 36ES2, two drives that basically contain the same mechanics (for the 20 and 40 gig 'Cuda ATA IV, even the platter count would be the same) but different electronics. Using storagereview.com's comparison feature, the result looks like this: [snip] But it's not that simple; and SR's benchmarks are inherently saddled with "assumption-itis". Regardless of any particular model-specific comparison, such as that SR test you pointed to, one of the defining characteristics of the "IDE vs. SCSI" question is that IDE is a relatively "dumb" interface which requires that the host system handle most of the I/O "grunt work"; whereas, SCSI is an "intelligent bus" all its own, which can receive a (relatively high-level) "order" from the host system, then go off and execute it with little or no further micro-management from the host. So on a relatively fast host system which is not otherwise "preoccupied", benchmarks like those used in that SR article can make IDE look better than it really is "in real life". For a more realistic test, measure the performance of some other CPU/memory-intensive application, *while* a large read/write operation is in progress. That's where you'll see one of the big advantages of SCSI. It gets even more conspicuous when you get into things like RAID striping/mirroring, etc. -- Jay T. Blocksom -------------------------------- Appropriate Technology, Inc. usenet01[at]appropriate-tech.net "They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety." -- Benjamin Franklin, Historical Review of Pennsylvania, 1759. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Unsolicited advertising sent to this E-Mail address is expressly prohibited under USC Title 47, Section 227. Violators are subject to charge of up to $1,500 per incident or treble actual costs, whichever is greater. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
#5
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wrote: Ok, time to get my SCSI-ness together. I've been an IDE person since I can remember. This would be the first board I've owned with SCSI capabilities. The board appears to have two scsi connectors, one for 50 pin and the other 68 pin. I've got lots of 50pin scsi connectors lying about the house from some purchas or other I made on E-bay. Is one option (50 vs 68 pin) better than another? Is there a difference other than the obvious, the pin count? I have noticed that there are all sorts of SCSI drives, connectors and adaptors. What are the differences between them? Do I need to know anything special about the cables? Would a 7200RPM scsi drive run faster (to make a real difference) than an ATA100 7200RPM IDE drive? Is it the 40Mhz bus which makes the difference? How would I go about buying a SCSI drive that would go with this board? Meaning: are there any special characteristics the drive must have to work with this board? Are there some SCSI drives which would not work with this board? Or perhaps they would with the right PCI SCSI controller card? lots of questions. If you know of a good teaching link, maybe that'll suffice. thanks in advance Hi Eric, Just a couple of comments to add to the excellent responses so far... There are actually 3 SCSI connectors on the P2B-DS, one 50-pin and two 68-pin. The 68 closest to the memory slots is UltraWide (40MB/s) and is intended primarily for external devices - the board originally came with a cable to extend the connection to the rear panel. The other 68 is Ultra2Wide (80MB/s) and is the one you should use for fast internal drives. Again, Asus originally supplied an LVD cable and active terminator for use on this connector. You must have a terminator on the end of the cable since LVD drives do not provide termination. I second Stephan's comments regarding Seagate 36ES drives - I have a dozen or so of these in total, and find them to be the ideal drive for P2B-S/DS systems: low noise levels, reliable, and single-drive throughput is sufficient to almost saturate the 80MB/s U2W bus. Unfortunately others seem to have figured this out - I'd grown accustomed to buying used 18gig 36ES drives for around $50, but recent eBay prices have escalated to more than 3 times that! www.scsifaq.org is a great place to learn more about SCSI, and comp.periphs.scsi is the NG to use for questions not answered there. P2B http://tipperlinne.com/p2bmod |
#6
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On Wed, 12 May 2004 22:20:48 -0400, P2B wrote:
off the basic topic, but, You know, my first thoughts about the fact that this board comes stock with the 133 mhz 44mhz pci jumper option was that, well, most of those server folks are gonna use scsi drives and so it doesn't really matter. ( I thought to myself) But then, thinking that most folks were probably using this mobo as a server, we have the problem that network cards are pretty bad at supporting high pci bus speeds, So there went that theory, not to mention the AGP bus. thanks everyone for your contributions to my mental chemistry set. Oh yeah, I'm a "top-poster". I've been one for several years now, after we had this debate on the winhome mailing list about it and several semi-blind folks chipped in that it was far easier for them to maneuver through the posts if the answers went at the top. eric Hi Eric, Just a couple of comments to add to the excellent responses so far... There are actually 3 SCSI connectors on the P2B-DS, one 50-pin and two 68-pin. The 68 closest to the memory slots is UltraWide (40MB/s) and is intended primarily for external devices - the board originally came with a cable to extend the connection to the rear panel. The other 68 is Ultra2Wide (80MB/s) and is the one you should use for fast internal drives. Again, Asus originally supplied an LVD cable and active terminator for use on this connector. You must have a terminator on the end of the cable since LVD drives do not provide termination. I second Stephan's comments regarding Seagate 36ES drives - I have a dozen or so of these in total, and find them to be the ideal drive for P2B-S/DS systems: low noise levels, reliable, and single-drive throughput is sufficient to almost saturate the 80MB/s U2W bus. Unfortunately others seem to have figured this out - I'd grown accustomed to buying used 18gig 36ES drives for around $50, but recent eBay prices have escalated to more than 3 times that! www.scsifaq.org is a great place to learn more about SCSI, and comp.periphs.scsi is the NG to use for questions not answered there. P2B http://tipperlinne.com/p2bmod |
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