Areca 24/4 Internal/External Port Pcie 3.0 12 Gb/s SAS/SATA Raid Controller 2Gb Cache - Manual (Page 153)

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WEB BROWSER-BASED CONFIGURATION
Click on the RAID set number to activate in the select column.
Click on the “Submit” button on the screen to activate the RAID
set that had a disk removed (or failed) in the power off state. The
SAS RAID controller will continue to work in degraded mode.
6.5.7 Create Hot Spare
When you choose the “Create Hot Spare” option in the “Raid Set
Function”, all unused physical devices connected to the current
controller appear. Select the target disk by clicking on the ap-
propriate check box. Tick on the “Confirm The Operation” check
box and click on the “Submit” button in the screen to create the
hot spares. The “Create Hot Spare” gives you the ability to define
a global or dedicated hot spare. Unlike “Global Hot Spare” which
can be used with any RAID sets, “Dedicated Hot Spare” can only
be used with a specific RAID set or Enclosure. When a disk drive
fails in the RAID set or enclosure with a dedicated hot spare is
pre-set, data on the disk drive is rebuild automatically on the
dedicated hot spare disk.