IBM DS3950, Инструкция по установке, использованию и обслуживанию, Страница: 165 / 252

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 the E-DDMs one at a time, perform the following steps:
1. Read the following information:
v “Replacing multiple E-DDMs” on page 133, particularly the paragraphs that
discuss the differences between the two possible upgrade procedures
v
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 unit. Correct
any problems that are reported. Upgrade the storage subsystem controller to
the level that supports the new E-DDMs, if required.
3. Back up the data in the arrays and logical drives that are configured using the
E-DDMs that you are replacing.
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 29.
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 the E-DDMs.
5. Use the DS Storage Manager software to make sure that the array that was
defined using these E-DDMs is in optimal (not degraded) state before
manually failing the first E-DDM you want to replace. If the array is in
degraded state, use the recovery procedures to bring the array into the
optimal state.
Make sure of the following:
v
You fail only one E-DDM.
v
The software status display shows a failed status for the applicable E-DDM.
v
The amber Drive fault LED (on the front bezel below the E-DDM) is on.
Attention: Removing the wrong E-DDM can cause data loss. Make sure that
you remove only the failed E-DDM CRU. To identify the failed E-DDM CRU,
look for the lit Drive fault LED.
If you remove an active E-DDM accidentally, wait at least 30 seconds and then
reinstall it. Because you failed two E-DDMs in a RAID array, the array might
be marked failed by the controller. This array will not be available to the host
for I/O. See the DS Storage Manager software for further recovery
instructions. Do not attempt to replace any E-DDMs until the array is brought
back to optimal state.
6. Use the procedures in “Replacing hot-swap E-DDMs” on page 132 to remove
the failed E-DDM. Use the procedures in “Installing hot-swap E-DDMs” on
page 130 to install the new E-DDMs into the storage subsystem.
The new E-DDM automatically reconstructs the data after you install it in the
drive slot.
Chapter 5. Replacing components
137