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Cabinet Configuration Guidelines
This section contains guidelines for properly placing and connecting the disk shelves.
Cabinet Configuration
For safety reasons, mount the heaviest equipment, typically disk shelves, at the bottom
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of the cabinet. Refer to the appropriate Oracle Safety and Compliance Guide for rack-
mounting guidelines.
To best prepare for cabling controllers to disk shelves, now and in the future, mount
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controllers in the middle of the cabinet.
Do not span disk chains across multiple cabinets.
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Do not remove cabinet panels to run cables between cabinets.
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Load Distribution
Balance the number of disk shelves across the disk chains in your system.
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The maximum number of disk shelves supported by each disk chain is six.
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Connect each disk chain to two HBAs if available.
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Do not mix disks with different capacities or rotation speeds within a single disk shelf.
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To maximize performance, use the maximum number of disk chains supported by the
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controller's SAS HBAs. For example, four SAS HBAs with eight chains and eight disk
shelves will have better performance than two SAS HBAs with four chains and eight disk
shelves.
Cable Lengths
The maximum cable length between DE2-24 disk shelves is two meters.
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The maximum cable length between Sun Disk Shelves is 0.5 meters.
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The maximum cable length between a controller and disk shelves is six meters.
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Using DE2-24 and Sun Disk Shelves Together
For controllers that support using DE2-24 and Sun Disk Shelves together, the controller
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must use 4X4 port SAS-2 HBAs.
Cabinet Configuration Guidelines
Installation Prerequisites and Hardware Overviews
15
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