On 03/06/12 10:40 PM, James A. Peltier wrote: > I've had to use inode64 on far smaller file systems (15TB) due to inode counts (many files) and not file system size. My understanding of it is, the inode number is its physical position on the disk. if the first 1TB (2^31 * 512) of the disk has no free space to create an inode for a new directory, then that inode requires 64bits. http://xfs.org/index.php/XFS_FAQ#Q:_What_is_the_inode64_mount_option_for.3F -- john r pierce N 37, W 122 santa cruz ca mid-left coast