Infortrend EonStor DS S12 Series Hardware Manual page 95

EonStor DS S12/S16/S24 Series Hardware Manual
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.
95