Administrator Guide

Live Volume support for Microsoft Windows/Hyper-V
71 Dell EMC SC Series: Synchronous Replication and Live Volume | CML1064
9.3 Round Robin with Subset (ALUA)
Round Robin with Subset (ALUA) is supported when a Live Volume is configured to report non-optimized
paths to server hosts. This ability is available with SCOS 7.3 and newer, along with DSM 2018 R1 and newer.
ALUA support is enabled by default when configuring a new Live Volume with SCOS 7.3.
Report Non-optimized Paths to a host server
A Windows server will detect the presence of non-optimal paths when this feature is enabled on a Live
Volume. In the MPIO settings, the MPIO policy indicates Round Robin With Subset. In this example (with
uniform server mappings), half of the paths are listed as Active/Optimized (paths to the primary Live Volume),
and the other half are listed as Active/Unoptimized (paths to the secondary Live Volume). There are four of
each kind of path, eight paths total. Figure 63 shows three paths; the other paths can be viewed by scrolling.
Active Optimized and Unoptimized paths