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mdadm: super1.x cannot open /dev/sdc2: No such file or directory
mdadm: ddf: Cannot open /dev/sdc2: No such file or directory
mdadm: Cannot open /dev/sdc2: No such file or directory
mdadm: device /dev/sdc2 not suitable for any style of array
The error message seems straightforward -- /dev/sdc2 doesn't seem to exist. Have you checked in /dev to see if it, in fact, there? Depending on the partitioning tool you used and your hardware, you may need to reboot the machine to see newly created partitions.
If you go into eg fdisk & create partitions, even when using 'w' to write the new partition table, sometimes the kernel won't see it until after a reboot.
One trick is to run the cmd partprobe http://linux.die.net/man/8/partprobe after using 'w' & exiting fdisk