IBM DS3500 Installation, User's, And Maintenance Manual page 72

10. Add the drives to the storage enclosure. Ensure that you wait for at least 30
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IBM System Storage DS3500 and EXP3500 Storage Subsystem: Installation, User's, and Maintenance Guide
2. Use the storage enclosure Rack Installation Instructions document to install
the new storage enclosure in the rack.
3. Connect the power cables to the new storage enclosure.
4. Power on the storage enclosure.
5. Connect one end of a Serial Attached SCSI (SAS) cable to the Drive expansion
port on Controller A in the DS3500 storage subsystem.
6. Connect the other end of the SAS cable to either of the In ports on the left
ESM in the storage enclosure.
7. Connect one end of a second SAS cable to the Drive expansion port on
Controller B in the DS3500 storage subsystem.
8. Connect the other end of the second SAS cable to the In port on the right ESM
in the storage enclosure.
9. Wait until the storage subsystem status is Optimal in the Storage Manager
software before proceeding to step 10.
seconds for the Storage Manager software to recognize each newly added
drive before you install another drive.
To add additional storage enclosures after the first storage enclosure is
connected to a dual-controller DS3500 storage subsystem, complete the
following steps:
a. Ensure that the storage subsystem status is Optimal in the Storage
Manager software.
b. Use the storage enclosure Rack Installation Instructions document to install
the new storage enclosure in the rack.
c. Connect the power cables to the new storage enclosure.
d. Power on the storage enclosure.
e. Connect one end of a Serial Attached SCSI (SAS) cable to the In port on
the left ESM in the storage enclosure that is being added to the
configuration.
f. Connect the other end of the SAS cable to the Out port on the left ESM in
the last storage enclosure in the configuration (this storage enclosure is
directly connected to the Drive expansion port on controller A of the
DS3500).
Note: The above step is true only for the configuration of the EXP3500
storage subsystem expansion unit. For DS3500 storage subsystem
dual-controller connections go to the next step.
g. On the last storage enclosure in the configuration, disconnect the SAS
cable from the In port on the right ESM and connect it to the In port on
the right ESM on the new storage enclosure that is being added to the
configuration.
Note: When the SAS cable is disconnected in step 7, a loss of path
redundancy occurs and an error message is displayed in the Storage
Manager Recovery Guru. Ignore this error message. The redundant path is
restored in step h after the SAS cable is connected.
h. Connect a SAS cable to the Out port on the right ESM of the new storage
enclosure and connect the other end to either of the In port on the right
ESM in the storage enclosure that was previously connected to controller B
of the DS3500.