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Loop IDs for FC-AL connected disks

For disks connected using Fibre Channel-Arbitrated Loop (FC-AL or FC), the loop ID is an integer between 16 and 126. The loop ID identifies the disk within its loop, and is included in the disk name, which identifies the disk uniquely for the entire system.

The loop ID corresponds to the disk shelf number and the bay in which the disk is installed. The lowest loop ID is always in the far right bay of the first disk shelf. The next higher loop ID is in the next bay to the left, and so on. You can view the device map for your disk shelves with the fcadmin device_map command.

For more information about the loop ID map for your disk shelf, see the hardware guide for the disk shelf.