Hi, On Thu, Jul 2, 2009 at 12:52, Bob Hoffman<bob at bobhoffman.com> wrote: > # mdadm --grow /dev/md1 --size=max If /dev/md1 is made out of /dev/sda2 and /dev/sdb2, it will not work, as those partitions will still be the same size as they were before... I think it would be easier to just create new partitions /dev/sda3 and /dev/sdb3, then create a new RAID1 /dev/md2, pvcreate it, and then use vgextend to add /dev/md2 to the same volume group that already contains /dev/md1. Does that make sense to you? Cheers, Filipe