IBM DS4700 manual

Attention: When you handle static-sensitive devices, take precautions to avoid damage from static electricity. For details about handling static-sensitive devices, see “Handling static-sensitive devices” on page 33.

4.Unpack the new E-DDMs.

Set the E-DDMs on a dry, level surface away from magnetic fields. Save the packing material and documentation in case you need to return them.

5.Perform the following steps:

a.Stop all I/O activity to the storage subsystem and attached storage expansion enclosures. Make sure of the following:

1)All of the green Drive activity LEDs on the front of the storage subsystem (and on all attached storage expansion enclosures) are not flashing.

2)The green Cache active LEDs are off. Refer to the IBM System Storage DS4700 Storage Subsystem Installation, User's, and Maintenance Guide for the location of the Cache active LEDs.

b.If applicable, use the operating system software to disconnect the storage subsystem logical drives from the host before you power off the storage subsystem.

Attention: To turn off all power to the storage subsystem, you must turn off both power supply and fan unit switches and disconnect both power cords. Use the procedure in step 6 for the proper shutdown sequence.

6.Turn off the power to each device based on the following shutdown sequence:

a.Turn off power to the host before you turn off power to the storage subsystem. If the host must stay powered on to support an existing network, see the operating system documentation for information about disconnecting the storage subsystem logical drives from the host before the storage subsystem is powered off.

b.Turn off power to the storage subsystem before you turn off power to the storage expansion enclosures. Turn off both power supply switches on the back of the storage subsystem.

CAUTION:

The power switch on the power supply and fan unit does not turn off the electrical current supplied to the device. The DS4700 Express Storage Subsystem might also have more than one connection to dc power. To remove all electrical current from the device, ensure that all dc power cords are disconnected from the power supply and fan unit dc input connectors.

c.Turn off power to other supporting devices (for example, management stations, fibre-channel switches, or Ethernet switches).

7.Use the procedures in “Replacing hot-swapE-DDMs” on page 155 to remove the E-DDMs that you want to replace. Use the procedures in “Installing hot-swapE-DDMs” on page 153 to install the new E-DDMs into the storage subsystem.

8.After you install all the new E-DDMs, check the system documentation for the hardware devices that you intend to power up, and then determine the proper startup sequence. Use the following power-on sequence, where applicable:

a.Turn on the power to the supporting devices (for example, Ethernet switches and management stations) before you turn off power to the storage subsystem.

b.You must turn on the storage expansion enclosures before the storage subsystem. The controllers might not recognize the correct configuration if

158IBM System Storage DS4700 Express Storage Subsystem: Installation, User’s and Maintenance Guide