Fibre channel loop and ID settings
When you install a hard disk drive in the storage expansion enclosure, the drive
tray plugs into a printed circuit board called the midplane. The midplane sets the
fibre channel loop ID automatically, based on the enclosure ID switch setting and
the physical location (bay) of the hard disk drive.
DS4000 storage expansion enclosure ID settings
DS4000 storage expansion enclosures have an enclosure ID switch that is used to
identify the DS4000 storage expansion enclosure on a fibre channel loop. The
enclosure ID switch is located on the back of the unit.
Use the small buttons above and below each enclosure ID digit to change the
enclosure ID setting. Press the button located above the digit to lower the digit by
one. Press the button located below the digit to raise the digit by one.
Note: Some DS4000 storage expansion enclosures ship with a panel installed over
the enclosure ID switch to prevent the enclosure ID from being changed
accidentally. If your DS4000 storage expansion enclosure has a protective
panel over the ID switch, use a pencil or a small screwdriver to change the
enclosure ID.
Each storage expansion enclosure in a DS4000 Storage Subsystem drive loop must
have a unique enclosure ID. DS4000 controllers use a combination of the enclosure
ID and the number of the physical slots that a hard drive occupies to create a
unique fibre channel loop address, or arbitrated loop physical address (AL_PA), for
each drive in a fibre channel drive loop. The enclosure ID consists of two digits, a
tens digit (x10) and a ones digit (x1). The enclosure IDs of the EXP710 and
EXP100 storage expansion enclosures must be manually set, whereas the
enclosure IDs of the EXP810s are automatically adjusted to be unique values by
the EXP810 ESM and the DS4800 controller firmware.
86 IBM System Storage DS4800 Storage Subsystem: Installation, User’s, and Maintenance Guide
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