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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
the MPIO 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.
SAS-Host Connections
Please contact your vendor to purchase compatible host-link cables.
SAS cables (28AWG x 8 pairs) are characterized by 100ohm, black colors, UL-approved,
lead-free, 50, 120 or 170cm cable lengths; connectors can be secured to chassis receptacle
using latching mechanism.
WARNING
All SAS cables are sensitive and must be handled with care. To prevent interference
within a rack system, the cable routing path must be carefully planned and the cables
must not be bent.
