How to recover from a drive failure in a RAID 5 configuration?

This morning a drive failed on our database server. The drive array (3 disks) is setup in a RAID 5 configuration. While we wait for a drive replacement we are preparing for a recovery strategy. Users are continuing to work on the system, albeit very slowly (don't know why??). How does one install the new... show more This morning a drive failed on our database server. The drive array (3 disks) is setup in a RAID 5 configuration.

While we wait for a drive replacement we are preparing for a recovery strategy. Users are continuing to work on the system, albeit very slowly (don't know why??).

How does one install the new drive - will the data for this drive automatically be rebuilt from the parity or is there another process we should follow?

Edit: This is a hardware RAID controller. (Thanks for the answers so far, appreciated)
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