CP of Datafile for Online Backup Returns "A system call received a parameter that is not valid."

Applies to:
Oracle Server - Enterprise Edition - Version: 10.2.0.3
AIX5L Based Systems (64-bit)

Symptoms
Coping a datafile after a 'begin backup' with the database is open returns an error:
A system call received a parameter that is not valid.


Cause
This problem is caused with the use of JFS2 file systems, CIO not enabled, and the parameter FILESYSTEMIO_OPTIONS set to SETALL.

Note 272520.1 - Direct I/O or Concurrent I/O on AIX 5L:
External utilities or tools cannot read datafiles on JFS2 file systems if you use the values SETALL or DIRECTIO for the FILESYSTEMIO_OPTIONS parameter. For more information, refer to the AIX
documentation which covers the open() restriction in cio mode.


Solution
1. Enable CIO on JFS2 file system

OR

2. Change FILESYSTEMIO_OPTIONS=asynch


Since its a dynamic initialization parameter you can use the ALTER SESSION,
ALTER SYSTEM commands to do this.

Parameter type
String

Syntax
FILESYSTEMIO_OPTIONS = {none | setall | directIO | asynch}

Default value
There is no default value.

Parameter class
Dynamic: ALTER SESSION, ALTER SYSTEM


References
Note 257338.1 - Direct I/O (DIO) and Concurrent I/O (CIO) on AIX 5L
Note 272520.1 - Direct I/O or Concurrent I/O on AIX 5L
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