Date: Fri, 13 May 2005 18:12:36 -0400 From: [EMAIL PROTECTED] Subject: Re: [PCI] SCSI
The 7300 has two *separate* SCSI buses (chains).
The internal is Fast SCSI-2 (10 MB/sec).
The external is regular SCSI-1 (5 MB/sec).
Adding a bit of nitpicking to Dan's excellent SCSI advice. Both SCSI busses on the 7300 are compliant with the SCSI-2 specification.
The internal bus supports the Fast SCSI-2 spec (10 MB/s).
The external/internal bus supports unenhanced SCSI-2 which is just 5 MB/s.
The distinction is important because a SCSI bus can be SCSI-2 without supporting Fast SCSI transfers. For example, many folks thought that the SCSI on the Beige G3 supported 10 MB/s because it is SCSI-2, but it is *unenhanced* SCSI-2 which maxes out at 5 MB/s.
hum. Do you have some doc reference for this?
If that external chain was actually SCSI-2, then it would require active terminations - and using passive ones on a long chain would result in bad reflections, manifesting as serious system instabilities. But that's not the case. While I may sometimes be mentally unstable, my 7300s with long chains are rock solid. And my tech docs say the interface is *SCSI-1*.
- Dan.
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