5.4. Mount Options - 32 or 64 bit Inodes

5.4. Mount Options - 32 or 64 bit Inodes

The inode's number is derived from its location on disk

Combination of allocation group, cluster and block

32 bit inodes (default):

Allocator can only place 32bit inodes in the first terabyte
- Using a larger inode size means less inodes per cluster allowing 32bit inodes to be located beyond the first terabyte
Allocator will rotate data extents across allocations groups to leave room for inodes

64 bit inodes:

Only available on 64bit machines
Use inode64 mount option to enable
Allows inodes to span the entire filesystem
Allocator will try to put file extents in same allocation group as inode
Not all backup tools support 64bit inodes
- Inode number used to uniquely identify files in backups

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