[SAP] R3trans error on AIX with async i/o

I have seen this situation while creating a new application server in a 6.40 system landscape on AIX 5L.

The startup of the dialog instance failed, because of the database could not be reached. A closer look at the log files shows the following situation.

shell> R3trans -d
This is R3trans version 6.13 (release 640 - 07.03.08 - 11:26:00).
unicode enabled version
--- Unicode interface [nlsui1.c line 1907] pid = 176430 :
Function dlerrorU16 :
Array err_msgU length MAX_ERROR_LN is too small.
--- Unicode interface ------ End of message ------
2EETW169 no connect possible: "maybe someone set invalid values for DIR_LIBRARY ('/usr/sap//SYS/exe/run') or dbms_type ('ORA')"
R3trans finished (0012).

This error message doesn’t help us a lot, so take a closer look at the file “trans.log”.

4 ETW000  [dev trc     ,00000]  Loading DB library '/usr/sap//SYS/exe/run/dboraslib.o' ...
4 ETW000                                                                              52  0.000205
4 ETW000  [dlux.c      ,00000]  *** ERROR => DlLoadLib: dlopen()= (null) -> DLENOACCESS (86,File name too long)
4 ETW000                                                                            2422  0.002627
4 ETW000  [dbcon.c     ,00000]  *** ERROR => Couldn't load library '/usr/sap//SYS/exe/run/dboraslib.o'
4 ETW000                                                                              38  0.002665

This error message is shown, if you are using the oracle database library and async i/o is not enabled  on the client side.

Check your async i/o settings on AIX the following way:

Correct

shell> lsdev -l aio0
aio0 Available  Asynchronous I/O (Legacy)

Wrong

shell> lsdev -l aio0
aio0 Defined  Asynchronous I/O (Legacy)

Howto configure async i/o

shell> smitty aio -> Configure Defined Asynchronous I/O
shell> smitty aio -> Change / Show Characteristics of Asynchronous I/O

Verify R3trans

shell> R3trans -d
This is R3trans version 6.13 (release 640 - 07.03.08 - 11:26:00).
unicode enabled version
R3trans finished (0000).