Areca 24/4 Internal/External Port Pcie 3.0 12 Gb/s SAS/SATA Raid Controller 2Gb Cache - Manual (Page 176)

WEB BROWSER-BASED CONFIGURATION
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6.8.4.1 Clone And Replace
You can enlarge your logical drives by copying and replacing all
member drives with drives of higher capacity. The existing data
in the logical drives is copied onto the new drives, and then the
original members are marked as “Offlined”.
6.8.4.2 Clone Only
The stand-by disk will clone the logical drives without substitut-
ing it. The status of the stand-by drive will be marked as “Of-
flined” after the cloning process. The source drive will remain a
member of the logical drive.
6.8.5 Abort Cloning
Use this function to stop the ongoing clone disk action.
6.8.6 Set Disk To Be Failed
It sets a normal working disk as “failed” so that users can test
some of the features and functions.