Bug 11938 - Ultra160 drives detect only 80MB/s, works in 2.2.12-20.
Summary: Ultra160 drives detect only 80MB/s, works in 2.2.12-20.
Alias: None
Product: Red Hat Linux
Classification: Retired
Component: kernel   
(Show other bugs)
Version: 6.2
Hardware: All Linux
Target Milestone: ---
Assignee: Michael K. Johnson
QA Contact:
Depends On:
TreeView+ depends on / blocked
Reported: 2000-06-07 08:09 UTC by Pekka Savola
Modified: 2008-05-01 15:37 UTC (History)
0 users

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2002-12-14 23:52:22 UTC
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description Pekka Savola 2000-06-07 08:09:08 UTC
We're using an Adaptec aic7xxx Ultra160 SCSI card with an external SCSI box
including two 160 MB/s drives and two 80MB/s drives.

2.2.14-12 kernel recognizes the card as 160M, but all of those drives
are detected as 80MB/s, even though the first two of them are actually

I installed kernel 2.2.12-20 on the side, and booted using it.  The two
drives were correctly detected as 160MB/s.  Seems to work with the older
kernel fine.

Comment 1 Alan Cox 2002-12-14 23:52:22 UTC
For a very long time the driver kept some 160 drives at 80 to deal with
fundamental problems. The new drivers finally fixed this in 2.4.

Alan (tidying bugzilla)

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