4-26 Sun StorEdge 3000 Family Installation, Operation, and Service Manual • May 2004
4.11 Setting Loop IDs on Expansion Units
When an expansion unit is attached to a RAID array, unique, hard-assigned loop IDs
are assigned to each expansion unit drive. A loop ID is the decimal version of an
arbitrated loop physical address (AL_PA). The lowest number loop ID is the lowest
priority address on the loop.
On the left front side of an expansion unit, an ID switch is used to set the loop IDs
for the disk drives to a different range of values so that the same IDs are not
repeated by RAID units and expansion units on the same loop.
Setting the loop ID on an array or expansion unit requires dropping the front bezel
out of the way and removing the small vertical plastic cap on the left side of the
bezel that covers the left rackmount tab. Rackmount tabs are also referred to as
“ears.”
FIGURE 4-20 Front Bezel and Front Bezel Locks of an Array
1. Use the provided key to unlock both bezel locks.
2. Grasp the front bezel cover on both sides and pull it forward and then down.
3. Remove the plastic cap from the left ear of the array.
a. Squeeze both sides of the cap at the top and the bottom.
b. Turn the cap toward the center of the array until it disengages and pull it free.
Caution – To avoid damage to the cap, do not pull the cap forward directly or pull
from only its top or bottom.
The ID switch is exposed when you remove the plastic cap.
Bezel locksPlastic “ear” cap covering loop ID switch
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