v
How extensive are the changes to the data while the array is in a degraded state
during the RAID array reconstruction and copyback process as result of replacing
an E-DDM in the array. The more extensive the data changes, the more work
that will need to be performed to restore the data in the event that the array
failed because of an additional E-DDM failed while the array is in degraded state.
Replacing
all
E-DDMs
at
the
same
time
Use this procedure to replace all E-DDMs at the same time. You must use this
method if you are upgrading E-DDMs containing RAID 0 logical drives. All the data
currently on the E-DDMs is lost when you replace them; therefore, you must back
up all data that is currently on the E-DDMs. This procedure also requires you to
turn off the EXP810 and the DS4000, which makes the storage subsystem (and any
attached storage expansion enclosures) inaccessible to other users.
Attention:
After you remove a drive CRU, wait 70 seconds before replacing or
reseating the E-DDM CRU to allow it to properly spin down. Failure to do so may
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 96, 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 DS4000.
Correct any problems that are reported.
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 30.
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 that:
1) All of the green Drive activity LEDs on the front of the storage
subsystem (and on all attached EXP810s) are not flashing.
2) The green Cache active LEDs are off. Refer to the
IBM
System
Storage
DS4800
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.
98
IBM System Storage DS4000 EXP810 Storage Expansion Enclosure: Installation, User’s and Maintenance Guide
Summary of Contents for DS4000 EXP810
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