Areca 24/4 Internal/External Port Pcie 3.0 12 Gb/s SAS/SATA Raid Controller 2Gb Cache - Manual (Page 39)

HARDWARE INSTALLATION
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Figure 2-19, Connect to LCD Status Panel
2.6 Hot-plug Drive Replacement
The RAID controller supports the ability of performing a hot-swap
drive replacement without powering down the system. A disk can
be disconnected, removed, or replaced with a different disk without
taking the system off-line. The RAID rebuilding will be processed
automatically in the background. When a disk is hot swap, the
RAID controller may no longer be fault tolerant. Fault tolerance will
be lost until the hot swap drive is subsequently replaced and the
rebuild operation is completed.
2.6.1 Recognizing a Drive Failure
A drive failure can be identified in one of the following ways:
1. An error status message lists failed drives in the event log.
2. A fault LED illuminates on the front of RAID subsystem if
failed drives are inside.
2.6.2 Replacing a Failed Drive
With RAID subsystem drive tray, you can replace a defective
physical drive while your computer is still operating. When a new
drive has been installed, data reconstruction will be automatically
started to rebuild the contents of the disk drive. The controller
always uses the smallest hotspare that “fits”. If a hotspare is used
and the defective drive is exchanged on-line, the new inserted
HDD will automatically assign as a hotspare HDD.