Since the threadstarter hasn't provided any data that could shed any light on his problem I'm jsut left to guesses.

Having said this: There are some limitations in jfs which may cause the problem: "Number of Bytes per Inode" and "Allocation Group Size" for instance. In this case the only thing you can do is to back up the FS, drop/recreate it with different values and restore the data.

bakunin