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Date:	Sun, 4 Aug 2002 17:31:21 PST7
From:	"Steven Levine" <steve53@earthlink.net >
Reply-To:	scoug-help@scoug.com
To:	scoug-help@scoug.com
Subject:	SCOUG-Help: SCSI 80 <--> 68 pin

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In <152.20.22.39.03.08.2002@constellation>, on 08/03/02
at 07:24 PM, larry.tawa@worldnet.att.net said:

>I bought 3 Quantum ATLAS IV 36.4GB SCSI 7200rpm Ultra160 HDs at UBID.
>These drives are 80 pin. The bootable SCSI cards that I have been

As you probably know by now, this is known as a Single Connection Attach
(SCA) interface.

>looking at are 68 pin. I had plan on using a mobile "frame"/"cartridge"

That's not an issue. The extra 12 pins are for power, id encoding etc..
The system still uses an HBA with a 68 pin interface.

>Questions: (1) How reliable are the 80 <--> 68 pin SCSI conversions?

Depends on the quality of the adapter. Clearly, the quality can be very
good since SCA is primarily used in server environments.

>(2) Are the mobile "frame"/"cartridge" which have the 80 <--> 68 pin SCSI
>more or less reliable than #1?

See above.

The SCA interface has several features that are good for servers:

- it supports hot swap
- the id is encoded in the interface

You might consider buying an external case intended for SCA devices. It
might be cheaper than buying 3 decent quality interface adapters.

Steven

--
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"Steven Levine" MR2/ICE 2.31a #10183 Warp4/FP15/14.085_W4
www.scoug.com irc.webbnet.org #scoug (Wed 7pm PST)
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