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MA44611 - LIC HANG WHEN USING 4096 SECTOR DASD.

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 APAR (Authorized Program Analysis Report)

Abstract

LIC HANG WHEN USING 4096 SECTOR DASD.

Error Description

There is a race condition when two processors are updating a    
single page descriptor.  If both processors update the same byte
of the page descriptor nearly simultaneously, the first update  
is lost.  In this case the lost bit causes us to orphan an IO  
request.                                                        

Problem Summary

There is a race condition when two processors are updating a    
single page descriptor.  If both processors update the same byte
of the page descriptor nearly simultaneously, the first update  
is lost.  In this case the lost bit causes us to orphan an IO  
request.                                                        

Problem Conclusion

The layout of the page descriptor is changed to allow          
simultaneous accesses to the two bits of information such that  
we will not loose the contents of either bit.                  

Temporary Fix

Comments

Circumvention


PTFs Available

R720 MF60146 PTF Cover Letter   5310

Affected Modules

         
         

Affected Publications

Summary Information

Status............................................ CLOSED PER
HIPER........................................... No
Component.................................. 9400DG300
Failing Module.......................... RCHMGR
Reported Release................... R720
Duplicate Of..............................




System i Support

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Document Information

Modified date:
23 November 2015