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#1
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SCSI questions -- mostly curiosity
The context of these questions is this: I'm playing with, experimenting
with, and attempting to make use of some retired hardware that was manufactured about 1997. I'm doing it for my own edification and enjoyment and the world's affairs do not depend on the outcome. Then again, it would be nice to get a Linux box out of it. What I have is about a dozen 4 ~ 4.3 GB Wide SCSI hard disks, one CD-ROM, various cables, and half a dozen adapter cards. Mostly the cables aren't very well matched to the set of drives, but right now I have three of the 4.0 G Seagates running on an Adaptec 2940UW on an Intel 440BX mobo with a Pentium II/450 and 192 MB PC-100 RAM. The third of the three drives is currently in the formatting process. Now some questions and speculation: (1) The CD-ROM and one 4.2 GB Quantum HDD fit on a cable that resembles an IDE/ATA cable but has fifty pins instead of forty and is close to 3" wide. The three drives I have hooked up now have a 50-pin micro connector and a 1.5" wide cable with much finer wires. The 2940UW has connectors at the top edge for both. Can I put both cables on the one bus card, and will they be read as part of the same SCSI channel? (2) I read on a website earlier today that two computers can share a single SCSI bus. So if I put identical 2940 cards in two (or more!) computers, configure one card as ID 7 and one as ID6, and run a cable between, will both computers be able to use all the drives on the chain? I'm thinking something like this: CD-ROM with Internal Termination Active, ID 0 HDD (Quantum 4.2 GB), ID 5, FAT 32, Windows 98 boot Internal cable, 50-pin old style Adaptec Card in Windows 98 Machine, ID 6 External Cable Adeptec Card in Linux Box, ID7 Internal Cable, 50 pin micro style HDD, Seagate/Compaq ST34371W, ID 1, EXT3, Linux boot and usr HDD, Seagate/Compaq ST34371W, ID 4, EXT3 HDD, Seagate/Compaq ST34371W, ID 8, FAT32 Active Terminator Will this sort of setup work? What issues should I expect to confront? Thanks, and remember it's all for enjoyment. -- P. |
#2
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"Pelysma" wrote in message news:aLI8e.18850$H_5.14299@trnddc01... The context of these questions is this: I'm playing with, experimenting with, and attempting to make use of some retired hardware that was manufactured about 1997. P.S. the three Seagate drives are now formatted and Mandrake Linux 9.1 install is in progress. (I have 10.1 also, but it doesn't seem to have Tux Racer.) For now I'm using an IDE CD-ROM set up as primary master. -- P. |
#3
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Pelysma wrote: The context of these questions is this: I'm playing with, experimenting with, and attempting to make use of some retired hardware that was manufactured about 1997. I'm doing it for my own edification and enjoyment and the world's affairs do not depend on the outcome. Then again, it would be nice to get a Linux box out of it. What I have is about a dozen 4 ~ 4.3 GB Wide SCSI hard disks, one CD-ROM, various cables, and half a dozen adapter cards. Mostly the cables aren't very well matched to the set of drives, but right now I have three of the 4.0 G Seagates running on an Adaptec 2940UW on an Intel 440BX mobo with a Pentium II/450 and 192 MB PC-100 RAM. The third of the three drives is currently in the formatting process. Now some questions and speculation: (1) The CD-ROM and one 4.2 GB Quantum HDD fit on a cable that resembles an IDE/ATA cable but has fifty pins instead of forty and is close to 3" wide. The three drives I have hooked up now have a 50-pin micro connector and a 1.5" wide cable with much finer wires. The 2940UW has connectors at the top edge for both. Can I put both cables on the one bus card, and will they be read as part of the same SCSI channel? The cable with the finer wires is 68 pin. You can use 50 pin and 68 pin cables at the same time on the same bus. In that configuration the adapter is in the middle of the bus and there should be termination on the end of each cable. When in doubt use auto termination on the adapter. (2) I read on a website earlier today that two computers can share a single SCSI bus. So if I put identical 2940 cards in two (or more!) computers, configure one card as ID 7 and one as ID6, and run a cable between, will both computers be able to use all the drives on the chain? I'm thinking something like this: CD-ROM with Internal Termination Active, ID 0 HDD (Quantum 4.2 GB), ID 5, FAT 32, Windows 98 boot Internal cable, 50-pin old style Adaptec Card in Windows 98 Machine, ID 6 External Cable Adeptec Card in Linux Box, ID7 Internal Cable, 50 pin micro style HDD, Seagate/Compaq ST34371W, ID 1, EXT3, Linux boot and usr HDD, Seagate/Compaq ST34371W, ID 4, EXT3 HDD, Seagate/Compaq ST34371W, ID 8, FAT32 Active Terminator Will this sort of setup work? What issues should I expect to confront? It should work, but you should not attempt to access devices with both PCs at the same time. To comply with Adaptec specs you should not use three segments, i.e. two internal and one external cable at the same time. This rule, along with termination specs, is often ignored with everything working. You don't need active termination with a 2940UW. A terminated device on the end of each cable will suffice. Thanks, and remember it's all for enjoyment. -- P. -- Mike Walsh West Palm Beach, Florida, U.S.A. |
#4
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"Mike Walsh" wrote in message ... You don't need active termination with a 2940UW. A terminated device on the end of each cable will suffice. There's an active terminator built into the end of the cable I'm using, that's all. One of the things I'm not sure about is how to terminate/not terminate at the adapter, but if it doesn't do it automatically, it's certainly done with software. Thanks for a lot of good stuff! P. |
#5
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"Mike Walsh" wrote in message ... The cable with the finer wires is 68 pin. You can use 50 pin and 68 pin cables at the same time on the same bus. The cable with the finer wires is 50 pin. I wish I had a couple of the analogous 68-pin cables in the box, because a number of the drives have this connector, and it is also the interface between an old HP server and Compaq external array in the same collection. Update: The computer is now running here next to me with a 4 GB IDE drive, two of the 4GB SCSI drives, and a CD-RW, but the Linux installation bit the dust because I needed the box for a completely different project. It's now running Win2K for the benefit of my ASP.NET homework. When the term is over, Linux gets it again. Although it takes extra time, I like the way the SCSI drives roll up to speed one at a time to reduce the load on the PSU. It has the feeling of a well-thought-out and well-working process about it. Thanks, P. |
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