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I have installed redhat 5 in one hdd. Now i want to mirror ( raid 1 ) running hdd with new another hdd. what is the command to do mirroring. when i had tried to do the same thing, the error occured that can not open /dev/hdc: Device or Resource busy, mdadm : create aborted.
hdc is linux installed hdd. below command used.
mdadm -C /dev/md0 --level=1 --raid-devices=2 /dev/hdc /dev/hdd
Pls help me to solve the problem.