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SCSI advice please!!! newbie to scsi here!

mcveigh

mcveigh

Diamond Member
I am looking at trading for a FUJTISU 18.2GB 10000RPM ULTRA-160 SCSI SCA 80PIN LVD.
I am thinking of buying a tekram DC-390U3W but it has no 80 pin connector, Ive heard there are adapters, is it ok to use them or will it cause problems?

AHA-3940AUWD from adaptec is another Im considering
from the seller:


<< The only difference is that the the AUW has
one external connector, and the AUWD has two external
connectors, both of the VHD variety. I suspect that
the VHD connectors are going to make external cables
very expensive.
 >>



Channel A connectors:
internal
one 68 pin
one 50 pin
external
one VHD

Channel B connectors:
internal
one 68 pin
external
one VHD

what is VHD? will this affect devices I can use?


 
VHD stands for Very High Density. It's a 68pin external connector. I wouldn't worry about external connectors. Just get an LVD capable 80pin-68pin adapter and mount the drive internally.
 
I would avoid SCA adapters. Some people have no problems, many do. If you go that route, make sure you get one that is LVD compatible - many aren't. VHD (very high density) is just the type external connector the card has on it. In your case, you won't be using it.
 
sca adapters? is that what i need to convert 80pin to 68?

I found a mobile rack that has 80pin connector to HD and 68 pin to controller
http://directron.com/icydock.html


Icy Dock Removable/mobile hard disc drive (HDD) rack/case for 5.25" bay desktop. Internal 80-Pin ultra wide SCSI connection. Front LED, cooling fan. Model: MB988-LCKF.

# Key Features: Aluminum Alloy Eject-out handle and Changeable Front Panel.
# Fan Failure/Over Heat Alarm Function (Green LED Change To Amber & Buzzer Sounds).
# Aluminum Alloy Structure & Front Cooling Fan Bring Excellent Heat Dispersion.
# Built-in SCSI ID Selector & Front LED Display SCSI ID address.
# Support Single End, Differential, and Ultra II (LVD).
 
Yes, that is not an LVD case... secondly you know you will have to purchase an external LVD terminator with an external case even if you find an LVD enclosure. Ive seen 2 bay LVD enclosures on Ebay for about 50 shipped, but then you can figure another 20 dollars easily for the terminator. A good LVD SCA internal adaptor can be had for about 15 dollars or less. Post a WTB on the ForSale forum and you may find one for less. If you mount it internally you will need the LVD internal cable with terminator. I would assume that will come with your controller. I use SCA adaptors with no problems. Its usually only a problem if you get a non LVD adaptor.
 
I thought we had a scsi FAQ, i guess we need one.

so with

FUJTISU 18.2GB 10000RPM ULTRA-160 SCSI SCA 80PIN LVD.
SCA68LVD 80 to 68 converter
and one of these cards im set right?

the aha3940auwd is old tech right the Tekram DC-390U3W would be better?
Im still confused on lvd vs vhd is one better?
and is 80 pin older than 68? I m having a hard time finding cards w/ 80 pin interfaces

Thanks for your help!
 
80 pin is meant for SCA hotswap bays like found in hotswap raid enclosures. 68 pin is designed for single drive applications or direct cable connections. The SCA 80 pin has no power or 68 pin cable interface, so to use it you need to get the adaptor to make it like a 68 pin drive. That is primarily why they are cheaper than a 68 pin drive. LVD is low voltage differential, and allows for longer cabling and higher transfer rates. The Tekram you have selected will work fine for your application. You can even use an U2W controller for single drive acceses.
 


<< the aha3940auwd is old tech right the Tekram DC-390U3W would be better? >>


The 3940 is old stuff. You should be looking at an Adaptec 19160, Tekram DC-390U3W or LSI U160. (Make sure whichever one you get comes with a cable, if not buying one will set you back $35+)


<< Im still confused on lvd vs vhd is one better? >>


That's two different things. LVD is low voltage differential which is the signaling protocol used by current Ultra2 and Ultra160 drives. VHD is a type of external connector - it is just a connector, not a protocol type. It's only used for external devices, not an internal hard drive.


<< SCA68LVD 80 to 68 converter >>


The standard internal connector these days for SCSI is 68-pins. The drive has a 68-pin connector. The controller has 68-pin connectors. LVD cables have 68-pin connectors. SCA is an interface used mostly in servers to plug a drive into a SCSI backplane in the server or the backplane in an external chassis. The additional pins carry power and SCSI ID information. If you want to use an SCA drive in your system, you will need to get an adapter and make sure it is LVD compatible. You really want to go 68-pin and skip SCA altogether unless the price difference is great. People often run into problems with the adapters.


<< and is 80 pin older than 68? I m having a hard time finding cards w/ 80 pin interfaces >>


That's because there aren't any.
 
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