| Title: | Ask the Storage Architecture Group |
| Notice: | Check out our web page at http://www-starch.shr.dec.com |
| Moderator: | SSAG::TERZA N |
| Created: | Wed Oct 15 1986 |
| Last Modified: | Fri Jun 06 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 6756 |
| Total number of notes: | 25276 |
I have heard some people say that putting a narrow drive in a wide
only subsystem will cause all wide drives to perform in 8 bit mode.
I have also seen discussions about how the contoller should
negotiate with the drives for the width. i.e. 8 bit or 16 bit, and
then talk narraow to narrow drives and wide to wide drives.
Are both statements correct?
Bill
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 6472.1 | LEFTY::CWILLIAMS | CD or not CD, that's the question | Thu Mar 13 1997 07:24 | 8 | |
The first staement is incorrect.
There were some older SW drives which would prevent wide operation due
to design problems in the flex cables, but we have not made those for a
couple of years.
Chris
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| 6472.2 | I wish I had a nickle,,,, | SUBSYS::VIDIOT::PATENAUDE | Ask your boss for ARRAY's... | Thu Mar 13 1997 07:40 | 18 |
> I have heard some people say that putting a narrow drive in a wide > only subsystem will cause all wide drives to perform in 8 bit mode. False. Wide is something that a wide controller negotiates on a per device basis. The problem chris eluded to in -.1 dealt with pre-12/94 SBB's having the upper 8 bits grounded on the flex. This in turn caused the wide drives to disapper when a narrow drive was placed on the bus. > I have also seen discussions about how the contoller should > negotiate with the drives for the width. i.e. 8 bit or 16 bit, and > then talk narraow to narrow drives and wide to wide drives. Close, you do not negotiate narrow. You negotiate wide, the default is narrow, so if the device wll not habla wide you stay at default. roger. | |||||