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
APAR Information
APAR number
IZ98546
Reported component name
AIX V7.1
Reported component ID
5765H4000
Reported release
710
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Submitted date
2011-04-07
Closed date
2011-04-07
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 V7.1
Fixed component ID
5765H4000
Applicable component levels
R710 PSY U838103
UP11/10/05 I 1000
PTF to Fileset Mapping
U838103 bos.net.nfs.client 7.1.1.0
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Document Information
Modified date:
11 April 2013