b. Connect the other end of the SAS cable to one of the In (↑) SAS connectors
on the left ESM in the EXP3500 storage enclosure.
2. Connect the left ESM of the EXP3500 storage enclosure to the next EXP3500
storage enclosure in the chain:
a. Connect one end of a SAS cable to the Out (↓) SAS connector on the left
ESM of the EXP3500 storage enclosure that you just connected.
b. Connect the other end of the SAS cable to one of the In (↑) SAS connectors
on the left ESM in the next EXP3500 storage enclosure in the chain.
c. Repeat steps 2a and 2b for each EXP3500 storage enclosure that you add.
3. Connect the last EXP3500 storage enclosure in the chain to controller B:
a. Connect one end of a SAS cable to the drive expansion port on the DS3500
controller B.
b. Connect the other end of the SAS cable to one of the In (↑) SAS connectors
on the right ESM in the last EXP3500 storage enclosure of the chain that
you created.
4. In reverse order (last in chain to first in chain), connect the right ESMs in the
EXP3500 storage enclosures in the chain:
a. Connect one end of a SAS cable to the Out (↓) SAS connector on the right
ESM of the EXP3500 storage enclosure that you just connected.
b. Connect the other end of the SAS cable to one of the In (↑) SAS connectors
on the right ESM of the previous EXP3500 storage enclosure in the chain.
c. Repeat steps 2a and 2b until you connect the right ESM of the first EXP3500
storage enclosure in step 2 to the right ESM of the EXP3500 storage
enclosure in step 1 on page 47.
Connecting storage enclosures to the DS3500
The DS3500 supports either the EXP3512 or the EXP3524 storage enclosure. The
DS3500 supports up to 192 drives (with controller firmware 7.77.xx.xx and later) or
96 drives (with controller firmware 7.75.xx.xx and earlier).
The total number of storage enclosures supported varies depending on the model
of DS3500 storage subsystem and EXP3500 storage enclosure. See the following
tables Table 11 and Table 12 on page 49.
Table 11 shows the maximum number of EXP3512 and EXP3524 storage enclosures
that can be attached to either a DS3512 or a DS3524 storage subsystem, and not
exceed 192 total disk drives with controller firmware level 7.77.xx.xx and later. Any
combination of EXP3512 or EXP3524 storage enclosures can be attached to a
DS3512 or a DS3524 as long as the total number of disk drives does not exceed
192.
Table 11. Maximum number of EXP3512 and EXP3524 storage enclosures with controller
firmware level 7.77.xx.xx and later
DS3512 DS3524
Storage
enclosures
Quantity Storage
enclosures
Quantity
EXP3512 15 14 13 12 EXP3524 7654
EXP3524 0011 EXP3512 0256
or or
48 IBM System Storage DS3500 and EXP3500 Storage Subsystem: Installation, User's, and Maintenance Guide
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