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Galaxy Web GUI User Reference Manual
3-30 Host LUN (LUN Mapping)
High Availability Concerns
The access from multiple data paths is allowed in conditions that you
want to obtain path redundancy with data links from redundant RAID
controllers. Data paths from the controller having the ownership of a
logical drive will be active, while those from the partner controller will
be passive. This method is known as TPGS (Target Port Group
Service) or ALUA, and requires the RitePath multi-pathing driver on
the host side. For example, if a logical drive is assigned to controller
A, the data links from controller A will become active paths in normal
conditions. You can use the filtering options to allow logical drive
mapping to controller B IDs for making stand-by (passive) paths from
Controller B. This way, you have path redundancy in an IP SAN.
The sample below shows how path redundancy is achieved by
mapping a logical drive to multiple host LUNs. You can also find
similar samples in your hardware manual, Chapter 7 in the iSCSI
series firmware manuals.
Figure 3-3: A Sample Mapping Scheme
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