to turn off the storage expansion enclosures and the DS5020, which makes the
storage subsystem (and any attached storage expansion enclosures) inaccessible
to other users.
Attention: After you remove an E-DDM CRU, wait 70 seconds before replacing or
reseating the E-DDM CRU to allow it to properly spin down. Failure to do so might
cause undesired events.
To replace all the E-DDMs at the same time, perform the following steps:
1. Read the following information:
v The information in “Replacing multiple E-DDMs” on page 134, particularly
the paragraphs that discuss the differences between the two possible
upgrade procedures
v The information in your software documentation regarding E-DDM upgrades
and installation
v The documentation that comes with the new E-DDMs
Read all precautionary notes, kit instructions, and other information. Kit
instructions often contain the most current information regarding the
E-DDMs and their installation, plus upgrade or servicing procedures.
Compare the kit instructions with this procedure to determine if you need to
modify this procedure.
2. Use the DS Storage Manager software to check the status of the DS5020.
Correct any problems that are reported. Upgrade the storage subsystem
controller to the level that supports the new E-DDMs, if required.
3. Perform a complete backup of the E-DDMs that you are replacing.
You need the backup to restore data on the E-DDMs later in this procedure.
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 31.
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.
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
136 IBM System Storage DS5020 Storage Subsystem: Installation, User’s, and Maintenance Guide
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