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Single-Controller and Dual-Controller Topologies
While creating a topology for a RAID enclosure that contains only one RAID controller module, attach
expansion enclosures that contain only one single environmental services monitor (ESM). Do not attach
an expansion enclosure that contains two ESMs to a single-controller RAID enclosure.
Labeling Cables
Cabling is an important part of creating a robust storage array. Labeling the cables identifies system
components and drive channels. System maintenance is easier when the cables are correctly identified.
Label both ends of each cable. You can use adhesive office labels that are folded in half over the ends of
each cable. Mark the labels with the port identifiers to which the cable is connected. Additional
information can be provided by using color-coded cable straps (or ties) to group all cables associated
with one component or drive channel.
If a component fails, the cables must be disconnected, the failed component replaced, and the cables
reattached. Detailed labeling of the cables simplifies the component replacement process.
If you are adding a new expansion enclosure to an existing configuration, correctly labeled cables helps
identify where to connect the new enclosure.
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