Areca 24/4 Internal/External Port Pcie 3.0 12 Gb/s SAS/SATA Raid Controller 2Gb Cache - Manual (Page 26)

HARDWARE INSTALLATION
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installed. Be sure that the power is connected to either the cage
backplane or the individual drives.
In the backplane solution, SAS/SATA drives are directly connected
to 12Gb/s SAS system backplane or through an expander board.
The number of SAS/SATA drives is limited to the number of slots
available on the backplane. Some backplanes support daisy chain
expansion to the next backplanes. The 12Gb/s SAS RAID controller
can support daisy-chain up to 8 enclosures. The maximum drive
no. is 256 devices through 8 enclosures. The following figure shows
how to connect the external Mini SAS HD SFF-8644 cable from the
12Gb/s SAS RAID controller that has external connectors to the
external drive boxes or drive enclosures.
The following table shows the maximum number of 12Gb/s SAS
RAID controller supported:
Disks/Enclosure Expander Disks/Controller Volume
Max No. 128 12 256 128
Figure 2-6, Connecting to Drive Enclosure
Note:
The maximum no. is 32 disk drives included in a single RAID
set.