The VX_CONCURRENT advisory cannot be set on a file that is actively open by Quick I/O or ODM, nor can that file be concurrently opened with the O_CIO flag. A file opened with the O_CIO flag or that has the VX_CONCURRENT advisory set may not be concurrently opened by Quick I/O or ODM. Quick I/O and ODM access are not allowed for any files on a file system that is mounted with the -o cio
mount option.