PRIMECLUSTER Global File Services Configuration and Administration Guide 4.1 (Linux)

1.8.2 Unavailable functions

The GFS Shared File System dose not provide the following functions:

• Use as a root file system, /usr, /var, /opt
• File lock
• Setting of hard link for a directory
• open(2) from another node to a file mapped by mmap(2)
• mmap(2) from another node to a writeable file opened by open(2)
• open(2) from another node to a mmap(2) file for which MAP_SHARED and PROT_WRITE are specified
• mmap(2) which specifies MAP_SHARED and PROT_WRITE from another node to a writable open(2) file
• Assurance of data consistency when open(2) is executed for mmap(2) files from other nodes
• Assurance of data consistency when mmap(2) is executed for open(2) files from other nodes
• The strict file terminal management in the case of write(2) for open(2) file for which specified O_APPEND compete with write(2) from other nodes
• File sharing with other nodes by an NFS
• Use of IPv6
• quota function
• Assuring consistency of file data, which is written by write(2) (The I/O size is specified over 8KB), when the file is modified by the following operation.
  write(2), writev(2), pwrite(2), truncate(2), ftruncate(2), creat(2), open(2) (with O_TRUNC)
• Creation of block or character device files
• Access of block or character device files
• File access from another node to an input file of sendfile(2) or sendfile64(2)
• To use as a mount point
• Asynchronous I/O function
• Direct I/O function
• ACL function