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Problem(Abstract)
An onbar backup can run on XBSA errors, preceded by BAR_TIMEOUT warnings, due to a tcp/ip send problem in AIX.
Symptom
In baract.log file you'd see XBSA errors like the following:
XBSA Error: (BSACreateObject) A system error occurred. Aborting XBSA session.
or
XBSA Error: (BSAEndTxn) The transaction was aborted.
Due to the nature of the underlying tcp problem - a network communication hang causing the storage manager to wait on a package which the onbar client (XBSA library) has sent, but the tcp layer never fully transmitted - the errors might be preceded by BAR_TIMEOUT warnings for the given onbar_d process:
- (-43296) WARNING: BAR_TIMEOUT Storage Manager Progress may be stalled.
Other BSA* functions might be affected too, depending on storage manager used.
The current backup would be aborted after such error (and possibly retried depending on BAR_RETRY setting).
Cause
This has been identified as an AIX product defect under APAR IV22133
Environment
IBM Informix onbar on AIX. The problem might be more likely on AIX lpars using virtual network adapters.
Diagnosing the problem
When hitting such XBSA errors, determine whether AIX OS is affected by APAR IV22133 or its siblings.
Resolving the problem
Apply latest AIX fixpacks.
http://www-01.ibm.com/support/docview.wss?uid=swg21668439&myns=swgimgmt&mynp=OCSSGU8G&mync=E
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