How to rebuild or replace a drive in a RAID5 array [closed]

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http://serverfault.com – I have a 4 scsi drives in a RAID 5 configuration and one of them has failed leaving the server in an interim recovery configuration. I have 2 more drives in the server that just show up as unassigned in the Array Configuration Utility. The failed drive has been marked as failed and replaced with one of the unassigned drives in the same slot but the replaced drive is not being rebuilt. My queries are how to get the replaced drive rebuilt or how to add an unassigned drive as a spare at this point as I dont see an option for Spare Management. Any help would be appreciated. Thanks in advance. (HowTos)