On Jan 16, 2010, at 10:27 AM, Adrian Sevcenco <Adrian.Sevcenco at cern.ch> wrote: > Hi! > I have 2 identical hdd (1002FBYS) with the same firmware, etc .. > really > identical! when i try to add the second hdd to this raid1 array i have > the message that /dev/sdb is not large enough to join array!! > on the first hdd i have 100 mb unpartitioned at the end of disk (as i > understood that mdadm put there some info...) > Anyone, any idea what can be wrong? i already done this procees > several > times and this is first time i encounter this and i have no idea what > can be the problem .. Make sure the partitions are exactly the same, you can use sfdisk to copy the table from a to b. -Ross