Working With Hot-Swap Ddms - IBM System Storage DCS3700 Installation, User's, And Maintenance Manual

4. Open the two release levers.
a. The controller moves out of the bay approximately 0.6 cm (0.25 inch).
b. Pull the controller out of the bay.
c. Place the controller on a level surface.
5. Remove the cover.
6. Remove the two screws from the cover plate. Rotate the cover plate to release the alignment tab and
remove the cover plate from the controller.
7. Loosen the four captive fasteners on the card gently pull the card up off the connector and out of the
controller.
8. If the controller is going to be replaced without the optional host interface adapter, then secure the
cover plate back on the controller using two screws.
9. Install the cover.
10. Insert the controller into the chassis.
a. Make sure that the release levers on the controller are in the open position.
b. Slide the controller into the bay until it stops.
c. Push the release levers to the closed position.
11. Reconnect the cables that you disconnected.
12. If necessary, turn on the storage subsystem (see "Powering on the DCS3700" on page 68).

Working with hot-swap DDMs

This section explains how you can increase the storage expansion enclosure capacity by adding more
DDMs or by replacing existing DDMs with ones that have a larger capacity.
Before you begin, complete the following tasks:
v Read the safety and handling guidelines in "Safety" on page xi and in "Handling static-sensitive
devices" on page 25.
v Ensure that your current system configuration is working properly.
v Back up all important data before you make changes to data storage devices.
Before you install or remove DDM FRUs, review the following information:
v DDM FRUs:
– When adding DDM FRUs, if you are not installing all 60 DDM FRUs into the DCS3700, install the
DDM FRUs in each drive drawer in the front row (slots 1, 4, 7, and 10). To maintain uniform airflow
across all drive drawers, the storage expansion enclosure must be configured with a minimum of 20
drives, with four drives in the front row of each of the five drive drawers (slots 1, 4, 7, and 10).
– Use of non-supported drives in the storage expansion enclosures can cause the storage expansion
enclosures to fail.
– After you remove an DDM FRU, wait 90 seconds before replacing or reseating it to allow it to
properly spin down. Failure to do so may cause undesired events.
v Drive LEDs: Each DDM FRU tray has three associated LEDs, a green drive power/drive activity LED,
an amber Service Action Required LED, and a blue Service Action Allowed LED. These LEDs indicate
the status for that DDM. See Table 20 for the drive LED states and descriptions.
v DDM FRUs are not interchangeable between the DCS3700 and the EXP5060 storage expansion
enclosure.
Table 20. Drive LED activity
LED LED state
Activity LED Flashing green
100
IBM System Storage DCS3700: Installation, User, and Maintenance Guide
Descriptions
The green LED flashes to indicate Fibre Channel activity to the drive.