Important: Always connect the DS4800 controller port to the EXP810 ESM
port label 1B to ensure optimal drive channel performance. Do not connect
the DS4800 controller port to the EXP810 ESM port label 1A.
e. Connect drive port 1 (drive channel 3) of controller B to the port 1B on the
right ESM board of the last storage expansion enclosure in the group of
drive expansion enclosures. (See callout 5 in Figure 46 on page 66.)
Important: Always connect the DS4800 controller port to the EXP810 ESM
port label 1B to ensure optimal drive channel performance.
4. You can repeat steps 3a on page 63 to 3e on page 64 in order to connect other
groups of storage expansion enclosures to the DS4800, using the second ports
of the same dual-ported drive channel pair, and the first and second ports in the
other dual-ported drive channel pair, replacing the DS4800 drive ports
(mentioned in steps 3d on page 63 and 3e on page 64) with the appropriate
drive ports in the drive channels. The DS4800 currently supports a maximum of
112 drives in either eight 14-drive storage expansion enclosures or seven
16-drive storage expansion enclosures per drive channel in each controller. One
drive channel from each of controllers A and B must be connected to the same
set of storage expansion enclosures to provide drive channel redundancy. This
will result in the support of a maximum of 224 drives in 16 or 14 storage
expansion enclosures per DS4800, depending on storage expansion enclosure
type.
5. Set unique enclosure IDs for all storage expansion enclosures that are cabled to
the DS4800 for the EXP710 and EXP100 only. See “DS4000 storage expansion
enclosure ID settings” on page 86, and refer to your storage expansion
enclosure installation manual for details on setting the enclosure ID.
The DS4800 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 DS4800. 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.
DS4800 drive cabling rules and recommendations
Refer to these general rules and recommendations when completing the cabling
steps described in this document.
1. Do not connect a combination of more than eight EXP710/EXP100 or seven
EXP810 storage expansion enclosures to the two ports of a dual-ported drive
channel. Failure to observe this limitation might result in loss of data
availability.
2. Do not connect more than four EXP810 storage expansion enclosures to each
port of the dual-ported drive channel. There are no restrictions to four or less
storage expansion enclosures connected per drive port for the EXP710 and
the EXP100 storage expansion enclosures; however, IBM recommends using
the same rule for the EXP710/EXP100 enclosures to maximize drive channel
performance.
Note:
As long as there is one EXP810 enclosure behind a controller drive
port, the maximum number of enclosures that can be connected behind
that controller drive is four.
3. If there are four or more EXP710s to be connected to a channel, split them
evenly across the two channel ports associated with the channel. If there is an
odd number of EXP710s, then one channel port will have one more EXP710
connected to it than the other channel port.
Chapter 3. Cabling the storage subsystem 67
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