[CentOS] raid1 creation :: not large enough to join array

Adrian Sevcenco Adrian.Sevcenco at cern.ch
Sat Jan 16 15:27:12 UTC 2010

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 ..

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