Joshua Baker-LePain wrote:
Also note that it's the default for FSs created by anaconda at install time, but *not* (last I checked) a default for mke2fs. To turn dir_index on at mke2fs time, use the '-O dir_index' flag.
If you use tune2fs to add the option to an extant FS, then dir_index only applies to new directories (i.e. created after you added the option). To retroactively apply it to the whole FS, you have to do the tune2fs and then take the FS offline and run 'e2fsck -fD' on the device.
Thanks Joshua, that's good info. I didn't know about the anaconda interaction.