Areca 24/4 Internal/External Port Pcie 3.0 12 Gb/s SAS/SATA Raid Controller 2Gb Cache - Manual (Page 177)

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WEB BROWSER-BASED CONFIGURATION
6.8.7 Activate Failed Disk
It forces the current “failed” disk in the system to be back online.
“Activate Failed Disk” function has no effect on the removed disks,
because a “removed” disk does not give the controller a chance to
mark it as “failure”.
Followings are considered as “Removed-Disk”:
1. Manually removed by user.
2. Losing PHY connection due to bad connector, cable or back-
plane.
3. Losing PHY connection due to disk fail.
Basically, in the eyes of the controller, the disk suddenly disap-
pears due to whatever reason.
6.8.8 Identify Enclosure
To prevent removing the wrong enclosure, the selected Areca ex -
pander enclosure all disks fault LED indicator will light for physi-
cally locating the selected enclosure when the “Identify Enclo-
sure” is selected. This function will also light up the enclosure LED
indicator, if it is existed.