A fix is available
APAR status
Closed as program error.
Error description
Version 3 NFS exported Veritas filesystem has slow performance with dsync option. This is caused by an additional open and close done before a read or write operation. This additional open and close is done for performance optimization by other types of filesystems(gpfs) and is not needed by Veritas. J2 already is coded not to do it. Customer asked for a test nfs extension which allowed Veritas to avoid unnecessary path and it was successfully tested to improve performance without side affects.
Local fix
No local fix.
Problem summary
Copying a file raises CPU usage to 100% on the server. The client hangs and then times out.
Problem conclusion
Avoid doing additional open/close before a read or write call
Temporary fix
Comments
5300-10 - use AIX APAR IZ98366 5300-11 - use AIX APAR IZ98454 5300-12 - use AIX APAR IZ98090 6100-03 - use AIX APAR IZ97808 6100-04 - use AIX APAR IZ97663 6100-05 - use AIX APAR IZ86583 6100-06 - use AIX APAR IZ94570
APAR Information
APAR number
IZ98454
Reported component name
AIX 5.3
Reported component ID
5765G0300
Reported release
530
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Submitted date
2011-04-06
Closed date
2011-04-06
Last modified date
2013-04-11
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
AIX 5.3
Fixed component ID
5765G0300
Applicable component levels
R530 PSY U840406
UP11/06/16 I 1000
PTF to Fileset Mapping
U840406 bos.net.nfs.client 5.3.11.7
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Document Information
Modified date:
11 April 2013