EonStor DS S12/S16/S24 Series Hardware Manual
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Domain B. In a fault-tolerant topology, the SAS external links always connect to
the SAS ports on the same SAS Domain.
The SAS Domains can be identified by the expanders’ locations, i.e., upper
controller slot (Controller A/Slot A) or the lower controller slot (Controller B/Slot
B).
On the RAID subsystem, each RAID controller can be considered as managing a
separate SAS Domain. With the help of the port selector mechanism on the MUX
boards, the idea of SAS Domain applies even when SATA drives are used in a
dual-controller JBOD.
