Bug 136485

Summary: md/raid1 read retry does not work
Product: Red Hat Enterprise Linux 4 Reporter: Paul Clements <paul.clements>
Component: kernelAssignee: Doug Ledford <dledford>
Status: CLOSED RAWHIDE QA Contact: Brian Brock <bbrock>
Severity: high Docs Contact:
Priority: medium    
Version: 4.0CC: davej, jturner
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Hardware: All   
OS: Linux   
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Fixed In Version: Doc Type: Bug Fix
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Last Closed: 2004-12-13 12:36:38 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Blocks: 135876    
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Description Flags
raid1 bio clone on read error none

Description Paul Clements 2004-10-20 13:52:10 UTC 
From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.6) Gecko/20040116

Description of problem:
Currently, the mainline kernel (and therefore 2.6.8, which the RHEL 4
kernel is based on) do not correctly perform raid1 read retry. I
posted a patch to linux-raid on Sept 15 to fix this
(http://marc.theaimsgroup.com/?l=linux-raid&m=109527014728404&w=2).
Neil Brown has confirmed the problem and just yesterday posted an
expanded patch (including the fix for raid10 also):

description:
http://marc.theaimsgroup.com/?l=linux-raid&m=109824318228668&w=2

patch:
http://marc.theaimsgroup.com/?l=linux-raid&m=109824318202358&w=2


(My version of the patch, which applies to the RHEL4 kernel, and which
is basically identical to Neil's patch, is attached).

Version-Release number of selected component (if applicable):
kernel-2.6.8-1.528.2.10

How reproducible:
Always

Steps to Reproduce:
1. create md/raid1 array
2. fail the second drive while doing reads to the array
    

Actual Results:  read retry will be attempted but will always fail --
additionally the driver is unable to recover from the situation

Expected Results:  read retry should succeed

Additional info:
Comment 1 Paul Clements 2004-10-20 13:54:59 UTC 
Created attachment 105507 [details]
raid1 bio clone on read error
Comment 3 Dave Jones 2004-11-04 22:58:31 UTC 
fixed in cvs
Comment 4 Jay Turner 2004-12-13 12:36:38 UTC 
Patch is indeed present in 2.6.9-1.903_EL.  Closing out.