----- Original Message ---- > From: Adrian Sevcenco <Adrian.Sevcenco at cern.ch> > To: CentOS mailing list <centos at centos.org> > Sent: Sat, 16 January, 2010 15:27:12 > Subject: [CentOS] raid1 creation :: not large enough to join array > > 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 .. > > Thanks! > Adrian Last time I got this, it was because I was trying to add the whole disk (/dev/sdb) rather than the partition /dev/sdb1. I don't know enough about what you are doing or RAID for that matter to know if that is exactly what you are doing, but it may help. Regards, Ian.