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Repurpose spare drive in HP ProLiant RAID 5 array

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http://serverfault.com – We have 8 300GB SAS drives in a RAID5 + Spare configuration. It seems data capacity planning came up a bit short and I need more disk space. Instead of replacing drives with 600 GB models, I would like to take the Spare drive and add back to the array. Is this posible with the HP ACU without reconfiguring the entire awway and losing data? (HowTos)