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firmware to the same version. For information about supported drive firmware
versions, refer to the DS4000 Support Web site:
www.ibm.com/servers/storage/support/disk/
– Use of non-supported drives in the drive modules can cause the storage
subsystem to fail.
– In configurations with drives that can operate at different interface speeds, all
drives on a fibre loop must operate at the same and lowest possible interface
speed.
– Ensure that the speed of the EV-DDM CRU you are adding is supported in
the storage subsystem. For example, do not install a 2 Gbps EV-DDM CRU in
a storage subsystem that supports only 4 Gbps EV-DDMs.
– EV-DDM and E-DDM CRUs are not interchangeable between the DS4700 and
DS4200 Express storage subsystems or the EXP420 and EXP810 storage
expansion enclosures. Incorrect E-DDM CRUs display in the DS4000
Subsystem Management window as Uncertified. In addition, the EXP420 and
DS4200 Express EV-DDM CRUs do not fit into the EXP710 and older storage
expansion enclosures.
– After you remove a EV-DDM CRU, wait 70 seconds before replacing or
reseating the EV-DDM CRU to allow it to properly spin down. Failure to do so
may cause undesired events.
Attention
Before powering on the DS4200 Express Storage Subsystem, it must be
populated with at least two EV-DDMs. If at least two drives are not installed
in each attached storage expansion enclosure or DS4200 Express Storage
Subsystem, when you power on the DS4200 Express and its attached
storage expansion enclosures, your standard storage partition key might be
lost and must be regenerated using instructions on the IBM DS4000
Solutions and Premium Features Web site:
https://www-912.ibm.com/PremiumFeatures/
In addition, the resulting insufficient load to the enclosure power supplies
might cause them to intermittently appear as failed, falsely indicating the
power supplies are bad. All EV-DDMs in the DS4200 Express Storage
Subsystem and the connected storage expansion enclosure or enclosures
must contain no prior configuration data.
v EV-DDM CRU labels: A label is provided on the front of each EV-DDM. Use this
label to record the location information for each EV-DDM before you remove it.
Ensure that you keep track of the EV-DDMs and their corresponding bays. Also,
record the location information in Table 37 on page 146. If you install a EV-DDM
in the wrong bay, you might lose data.
v EV-DDM LEDs: Each EV-DDM CRU tray has two associated LEDs, a green
Activity LED and an amber Fault LED. These LEDs indicate the status for that
drive. See Table 31 on page 112 for the drive LED states and descriptions.
v EV-DDM CRUs are not interchangeable between the DS4200 Express and other
DS4000 storage subsystems.
Chapter 5. Replacing components
111
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