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my first scsi drive, help.

A

andré2005

Limp Gawd
Joined
Apr 18, 2005
Messages
128
newegg don't have. nor does tigerdirect. where can i find a 80pin, 320, normal pci slot, scsi controller card?
i found a scsi 36gb 15k 80pin 320 drive for $250
is a 80pin controller too much, should i get a 68pin drive? what do you guys think? any comments?

what's the difference between 80 and 68 pin scsi hds?

can someone help this is my first scsi buy?!
 
$250 for a 36GB 15K SCSI drive is actually pretty high. Only a Seagate drive of such stats should be over $250, and the Maxtor and Fujitsu drives are much faster, and can be had for just over $200 new. ZipZoomFly is also a much better SCSI hard drive dealer than Newegg, browse ZZF's SCSI selection here.

SCSI HBAs have 68 pin wide or 50 pin narrow connectors. 80pin connectors are designed for connecting drives to hotswap backplanes. SCSI devices are connected using 68pin SCSI cables - the 80pin interface is only for hot swapping and includes the drive's power and ground lines which should not be carried over the data cable. You will need to do one of two things to implement an 80 pin SCA drive:

A) Acquire 68 to 80 pin adapters (like this) to connect each of the drives to a 68pin Ultra Wide SCSI cable -OR-
B) Acquire a SCA backplane for mounting the drive(s).

You may also want to look at acquiring 68pin SCSI drives rather than 80pin SCA units, unless hotswap is a must for your application. You will also want to read up on a SCSI bus's requirements such as: cables, bus termination, device ID setting, and other factors that are alien to ATA users. Most any SCSI HBA will work in a 32bit PCI slot, the quick way to tell is if the edge connector has two notches in it, which means it supports the 5V signalling in a PCI slot as well as 3.3V signalling in a PCI-X slot
 
That unit is indeed universal, and explicitly states that it will owrk in a 5v sginalling PCI slot, so you are good to go.
 
thanks.

can you help again? now i don't know what cable to choose, it's confusing, help?

what're terminators? help
 
andré2005 said:
thanks.

can you help again? now i don't know what cable to choose, it's confusing, help?

what're terminators? help
Click to expand...

You're going to want a 68-pin cable, most likely, and an U160 one if you're running in a 32-bit PCI slot. (The 320 cables are a bit more expensive, and you can't go any faster than 133MB/s anyway, so why bother?)

Terminators are devices that attach to the end of a cable and kind of "seal the connection shut", so to speak. Without them, most (all, to the best of my knowedge) devices on your SCSI bus will not work. Some devices (Notably SCA enclosures) are self-terminating. Get one of these, and you won't need to worry about terminators. For example, my setup goes like this:

Motherboard (Normal PCI) -> LSI U160 PCI-X card -> U160 68-pin ribbon cable -> 5-bay SCA enclosure -> Fujitsu MAU 80-pin hard drive.

I'm guessing you'd want something more like this, though:

Motherboard (Normal PCI) -> LSI U320 PCI-X card -> U160 68-pin ribbon cable -> 68-pin hard drive -> Terminator.

You can get cables with LOTS of connectors on them, but if you're doing 68-pin, you're going to want at LEAST 3 connectors. One for the card, one for the drive, and one for the terminator. You only need one terminator per cable, and it's got to be at the opposite end of the cable from the card.

For example - Suppose you wanted 2 Hard Drives and a CD-ROM?

Motherboard (Normal PCI) ->
LSI U320 PCI-X card ->
U160 68-pin ribbon cable ->
......68-pin hard drive ->
......68-pin hard drive ->
......68-pin CD-ROM ->
Terminator.

Edit -Forgot to mention - Lots of cables are self-terminating these days. With these cables, you don't need to include the extra connector for a terminator, obviously.
 
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