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3. Depending on the type of storage expansion enclosure (10-/14-drive or 16-drive)
that you plan to connect to the DS4500 drive mini hub ports, see “Using
EXP500, EXP100, EXP700, or EXP710 storage expansion enclosures” on page
81 or “Using EXP810 storage expansion enclosures” on page 90 for instructions
on how to connect the DS4500 to the enclosures.
4. In non-EXP810 storage expansion enclosures, such as EXP710 or EXP100, set
unique enclosure IDs for all storage expansion enclosures that are cabled to the
DS4500. See “DS4000 storage expansion enclosure ID settings” on page 103,
and then refer to your storage expansion enclosure installation manual for
details on setting the enclosure ID.
The DS4500 Storage Subsystem locates the drives in the storage expansion
enclosures after you power on the configuration. Always connect power to the
storage expansion enclosures first and then connect power to the DS4500. After
you have powered on the configuration, use the DS4000 Storage Manager client to
check the status of the new drives, correct any errors found, and configure the new
drives.
Redundant drive loop cabling overview
The DS4500 Storage Subsystem supports two redundant drive loops. A redundant
drive loop consists of one or more storage expansion enclosures connected to a
controller using two sets of fibre channel cables. If one data path fails, the controller
uses the other data path to maintain the connection to the drive group.
Figure 55 on page 77 shows a storage subsystem containing one storage
subsystem and two redundant drive loops with four storage expansion enclosures
each. Each storage expansion enclosures group uses redundant drive loops to
connect to the DS4500 Storage Subsystem. Loop A and loop B make up one
redundant pair of drive loops. Loop C and loop D make up a second redundant pair.
Attention: To prevent loss of storage expansion enclosure redundancy, connect
the storage expansion enclosures as shown in Figure 55 on page 77.
76 IBM TotalStorage DS4500 Fibre Channel Storage Subsystem: Installation, User’s, and Maintenance Guide