If you need to disable Concurrent I/O, unmount the VxFS file system and mount it again without the -o cio mount option.
To disable Concurrent I/O on a file system using the mount command
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Shutdown the DB2 instance.
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Unmount the file sytem using the umount command.
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Mount the file system again using the mount command without using the -o cio option.
To disable Concurrent I/O on a DB2 tablespace
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Use the DB2 file system caching option as follows:
# db2 -v "alter tablespace tablespace_name file system caching"
where tablespace_name is the name of the tablespace for which you are disabling Concurrent I/O.