You can replace a control enclosure chassis.
Before you begin
Note: Ensure that you know the type of enclosure chassis that
you are replacing. The procedures for replacing a control enclosure
chassis are different from those procedures for replacing an expansion
enclosure chassis.
To replace an expansion
enclosure chassis, see Replacing an expansion enclosure chassis.
DANGER
When working on or around the system, observe the following
precautions:
Electrical voltage and current from power, telephone, and communication cables are
hazardous. To avoid a shock hazard:
- If IBM® supplied a power cord(s), connect power to this
unit only with the IBM provided power cord. Do not use the IBM provided power cord for any other product.
- Do not open or service any power supply assembly.
- Do not connect or disconnect any cables or perform installation, maintenance, or reconfiguration
of this product during an electrical storm.
- The product might be equipped with multiple power cords. To remove all hazardous voltages,
disconnect all power cords.
- Connect all power cords to a properly wired and grounded electrical outlet. Ensure that the
outlet supplies proper voltage and phase rotation according to the system rating plate.
- Connect any equipment that will be attached to this product to properly wired outlets.
- When possible, use one hand only to connect or disconnect signal cables.
- Never turn on any equipment when there is evidence of fire, water, or structural damage.
- Disconnect the attached power cords, telecommunications systems, networks, and modems before you
open the device covers, unless instructed otherwise in the installation and configuration
procedures.
- Connect and disconnect cables as described in the following procedures when installing, moving,
or opening covers on this product or attached devices.
To disconnect:
- Turn off everything (unless instructed otherwise).
- Remove the power cords from the outlets.
- Remove the signal cables from the connectors.
- Remove all cables from the devices.
To connect:
- Turn off everything (unless instructed otherwise).
- Attach all cables to the devices.
- Attach the signal cables to the connectors.
- Attach the power cords to the outlets.
- Turn on the devices.
- Sharp edges, corners and joints might be present in and around the system. Use care when
handling equipment to avoid cuts, scrapes and pinching. (D005)
Attention: Perform this procedure only if instructed to do so by a service action or the
IBM support center. If you have a single control enclosure,
this procedure requires that you shut down your system to replace the control enclosure. If you have
more than one control enclosure, you can keep part of the system running. However, you will lose
access to the volumes that are on the affected I/O group and any volumes that are in other I/O
groups that depend on the drives that are in the affected I/O group. If the system is still
performing I/O requests in all the I/O groups, schedule the replacement during a maintenance period
or other time when the I/O can be stopped.
Be careful when you are replacing the hardware components that are located in
the back of the system. Do not inadvertently disturb or remove any cables that you are not
instructed to remove.
Ensure
that you are aware of the procedures for handling static-sensitive
devices before you remove the enclosure.
Procedure
To replace a control enclosure chassis, complete the
following steps.
- If you are able to access either of the node
canisters with the service assistant, record the machine type and
model of the enclosure, the serial number of the enclosure, and the
two WWNNs for the enclosure.
- From the service assistant home page, open the location data for the node. Record the machine
type and model (MTM), the serial number, WWNN 1, and WWNN 2 from the enclosure column.
Note: If you are replacing the enclosure because neither node canister can start, retrieve this
information after you complete the replacement.
- Start the service assistant on one of the canisters.
- Go to the node location data on the home page.
- Record the machine type and model, the serial number, WWNN 1, and WWNN 2 from the node copy
column. The machine type and model and the serial number are also shown on the labels at the front and
back of the enclosure.
This
statement applies to all volumes in the I/O group that are managed
by this enclosure plus any volumes in other I/O groups that depend
on the drives in the affected I/O group.
- Verify that it is safe to remove the power from the enclosure. For each of the canisters, verify the status of
the system status LED. If the LED is lit on either of the canisters,
do not continue because the system is still online.
Note: If you continue
while the system is still active, you risk losing the clustered system
configuration and volume cache data that is stored in the canister.
- Turn off the power to the enclosure by using the switches on the power supply units.
- Record which data cables are plugged into the specific
ports. The cables must be inserted back into the same ports
after the replacement is complete; otherwise, the system cannot function
properly.
- Disconnect the cable retention brackets and the power cords
from the power supply units.
- Disconnect the data cables for each canister.
- Remove the power supply units from the enclosure.
- Remove the canisters from the enclosure. Record
the location of each canister. They must be inserted back into the
same location in the new enclosure.
- Remove all the drives and blank drive assemblies from the
enclosure. Record the location for each drive. They must
be inserted back into the same location in the new enclosure.
- Remove both enclosure end caps from the enclosure.
Important: Keep the left end cap because it is used
again.
- Remove the clamping screws that attached the enclosure
to the rack cabinet.
- Remove the enclosure chassis from the front of the rack
cabinet and take the chassis to a work area.
- Install the new enclosure chassis in the rack cabinet.
- Remove the end caps from the new enclosure and install
the clamping screws that attach the enclosure to the rack cabinet.
- Replace the end caps. Use the new right end
cap and use the left end cap that you removed in step 11. Using the left end cap
that you removed preserves the model and serial number identification.
- Reinstall the drives in the new enclosure. The
drives must be inserted back into the same location from which they
were removed on the old enclosure.
- Reinstall the canisters in the enclosure. The
canisters must be inserted back into the same location from which
they were removed on the old enclosure.
- Install the power supply units.
- Reattach the data cables to each canister by using the information that you recorded
previously.
Note: The cables must be inserted back into the same ports from which they were removed on the old
enclosure; otherwise, the system cannot function properly.
- Attach the power cords and the cable retention brackets
to the power supply units.
- Write the old enclosure machine type and model (MTM) and
serial number on the repair identification (RID) tag that is supplied. Attach the tag to the left flange at the back of the enclosure.
- Turn on the power to the enclosure by using the switches on the power supply units. The node canisters boot up. The fault LEDs are on because the new enclosure is not set
with the identity of the old enclosure. The node canisters log node error 504, reporting that they
are in the wrong location. In the system event log, these errors appear with an error code of
1192.
- Connect to the service assistant on one of the node canisters to configure the machine type and
model, serial number, and WWNNs that are stored in the enclosure. If you replace a node canister, connect to the canister that has not been replaced. You can
connect by using the previous service address. However, it is not always possible to maintain this
address. If you cannot connect through the original service address, attempt to connect by using the
default service address. If you still cannot access the
system, see the topic that contains information about connecting to the service
assistant.
- Use the Configure enclosure panel.
- Select the options to Update WWNN
1, Update WWNN 2, Update
the machine type and model, and Update the
serial number. Do not update the system ID. Use the node copy data for each of the values. Check that these
values match the values that you recorded in step 1. If you
were not able to record the values, use the node copy values only if none of them have all zeros as
their value. If any of the node copy values are all zeros, connect the service assistant to the
other node canister and configure the enclosure there. If you still do not have a full set of
values, contact IBM support.
Important: Step
27 writes the enclosure identity into the replacement midplane.
The replacement midplane cannot be used as a replacement part for a different enclosure after step
27 is completed.
- Click the Modify button. The node writes the data and attempts to restart.
Note: There are situations where the canisters restart and
report critical node error 508. If the node canisters fail to become
active after they restart when the enclosure is updated, check their
status by using the service assistant. If both node canisters show
critical node error 508, use the service assistant to restart the
nodes.
For any other node error, follow the
procedure for fixing node errors. To
restart a node from the service assistant, perform the following steps:
- Log on to the service assistant.
- From the home page, select the node that you want to restart from
the Changed Node List.
- Select .
The system starts and can handle I/O requests from the
host systems.Note: The configuration changes that are described in
the following steps must be performed to ensure that the system is
operating correctly. If you do not perform these steps, the system
is unable to report certain errors.
- Start the management GUI and
select . You
see an additional enclosure in the system list because the system
has detected the replacement control enclosure. The original control
enclosure is still listed in its configuration. The original enclosure
is listed with its original enclosure ID. It is offline and managed.
The new enclosure has a new enclosure ID. It is online and unmanaged.
- Select the original enclosure. Verify that it is offline and managed
and that the serial number is correct.
- Right-click the enclosure and select Remove. The physical hardware has already been removed. You can
ignore the messages about removing the hardware. Verify that the original
enclosure is no longer listed in the tree view.
- Add the new enclosure to the system.
- From the Actions menu,
select Add Enclosures.
- Because you already added the hardware, select Next on the first panel
that asks you to install the hardware. The next panel shows the unmanaged new enclosure.
- Follow the steps in the wizard. The wizard
changes the control enclosure to Managed.
- Select the enclosure and add it to the system.
- Select the new enclosure and verify that it is now online
and managed.
- Change the enclosure ID of the replaced enclosure
to that of the original enclosure. Right-click the control enclosure
and select Modify ID and change the ID to that
of the original enclosure.
- Check the status of all volumes and physical storage to ensure that everything is online.
- Restart the host application and any FlashCopy® activities, Global Mirror activities,
or Metro Mirror activities that were stopped.