In section 3.2 of the howto that comes with raidtools there is an example of a linear raidtab setup. This example doesnt have a line stating the chunk-size If i try to create my linear raid without stating a chunk-size then i get /dev/md0: Invalid argument and mkraid fails. AFAIK chunk sizes dont apply to linear raid so maybe it shouldnt be necessary to state in raidtab. In any case i guess the HOWTO should match the raidtools behaviour. I hope this info would be usefull for next time the HOWTO was updated. Thanks Glenn McGrath