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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.
Use Enclosure-specific spares to prevent a spare drive from participating in the
rebuild of a logical drive on another enclosure.
You can refer to the ID tags on the host links to see the related LUN mapping and
cable links routing paths.
Each logical partition is mapped to a single host channel ID. If you prefer path
redundancy, you can map a logical partition to IDs residing on two different channels.
You will then need a multipath driver to manage access through two different HBA
ports. The driver communicates with system firmware and performs load balance
and automated distribution of I/O.
If multiple servers can “see” a mapped volume, you will need to avoid access
contention using file locking software, port binding, or zoning feature by FC switches,
which limits the access from host to a specific LUN. If you have two servers in a
clustered configuration, access control will be performed by the clustering software.
