Just built a new FC6 machine, with 5x 320Gb drives and 1x 300Gb drive. Made a 300Gb partition on all the drives /dev/hd{c,d,e} and /dev/sd{a,b,c}... Trying to create an array gave me an error, since it thought there was already an array on some of the disks (and there was an old one).
I decided to clear off the superblock on the drives with mdadm --zero-superblock on all the drives. It worked fine on all drives, except for /dev/sd{b,c)1, which returns an error "mdadm: Couldn't open /dev/sdb1 for write - not zeroing". There doesn't seem to be a problem with the drive, as I've run a non destructive badblocks on it, and also done a dd if=/dev/zero of=/dev/sdb1 on it, and Ive written out 300Gb onto the partition.
When I try and create an array using these 2 partitions, I get an error
mdadm: Cannot open /dev/sdb1: Device or resource busy
mdadm: Cannot open /dev/sdc1: Device or resource busy
and it aborts. I've double checked that the drives aren't mounted anywhere. There's nothing in /var/log/messages either...
Any suggestions where to check next?
Graham
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