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You can refer to the ID tags on the host links to see the related logical volume mapping and
cable links routing paths. Through the cable links illustrated above, the configuration can
withstand a failure of a single component, e.g., controller, HBA, cable, or FC switch.
Each logical partition is redundantly mapped to multiple host channel IDs in an AAPP
(Active-Active-Passive-Passive) configuration. Logical volumes are managed either by the
controller A or by the controller B. The Passive IDs will only become functional when a
Single-Controller fails in the system. The EonPath driver is a must on the application servers.
The driver communicates with system firmware and performs load balance and automated
di
stribution of I/O’s across preferred paths (Active IDs on data paths). TPGS (Target Port
Group Service) is supported so that I/O’s are routed to the preferred paths.
Switched Fabric Connection (Single Controller)
Channels
Controller A
Host
CH0, CH1, CH2, CH3
Configuration Information
Controller
1
Host server
4
Data path connection
Data paths are attached to one or more FC
switches. SAN management measures,
such as switch zoning and port binding,
should be taken to avoid multiple servers
from accessing the same LUN.
Above is the sample drawing showing connections with each SFP port connected to FC
switches and then to host adapters. See logical associations in the drawing for LUN mapping
details.
