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6.7. 32bit and 64bit Inodes

By default, XFS will use 32 bit inode numbers.
If the system supports it, the -o inode64 option to mount to allow 64 bit inode numbers.
Once an inode has been written somewhere on the disk that requires a 64 bit inode number, the file system can no longer be used with 32 bit inode numbers
(IRIX can move inodes to 32 bit numbers with xfs_reno, this tool has not been ported to Linux, yet)