Adding a node or enclosure to increase the size of the system

You can add a node or enclosure to the system by using the CLI or management GUI.

An enclosure can be added to the system if the enclosure previously failed and is being replaced with a new enclosure or if a repair action causes the enclosure to be unrecognizable by the system. Adding an enclosure to the system increases the capacity of the entire system. When you add an enclosure to a system, check that the licensed functions of the system support the additional enclosure. For more information, see Licensed functions.

You can use either the management GUI or the command-line interface to add a node to the system. Some models might require you to use the front panel to verify that the new node was added correctly.

Before you add a node to a system, you must make sure that the switch zoning is configured such that the node that is being added is in the same zone as all other nodes in the system. If you are replacing a node and the switch is zoned by worldwide port name (WWPN) rather than by switch port, make sure that the switch is configured such that the node that is being added is in the same VSAN or zone.

Note: Use a consistent method (either only the management GUI, or only the CLI) when you add, remove, and re-add nodes. If a node is added by using the CLI and later re-added by using the GUI, it might get a different node name than it originally had.

You can use either the management GUI or the command-line interface to add an enclosure to the system. If you are adding an enclosure that was previously removed from a system, ensure that these conditions are met:

All hosts that accessed the removed enclosure through its WWPNs are reconfigured to use the WWPN for the new enclosure or to no longer access the enclosure. Failure to do so can result in data corruption.
Ensure that the system ID is reset on the new control enclosure. You can use either the command-line interface or the Service Assistant to verify the system ID on the new control enclosure.
To use the command-line interface, enter the following command:
```
chvpd -resetclusterid
```
To use the Service Assistant, complete the following steps:
- Connect to the service assistant on either of the nodes in the control enclosure.
- Select Configure Enclosure.
- Select the Reset the system ID option. Do not make any other changes on the panel.
- Click Modify to make the changes.

You can use either the addcontrolenclosure command or the Add Enclosure wizard in the management GUI. To access the Add Enclosure wizard, select Monitoring > System. On the System -- Overview page, select Add Enclosure to start the wizard. Complete the wizard and verify the new enclosure. If Add Enclosure is not displayed, it indicates a potential cabling issue. Check the installation information to ensure that the enclosure was cabled correctly.

Complete these steps to add an enclosure to the system by using the command-line interface:

Using the sainfo lsservicestatus command (on the service CLI of the new enclosure), record the WWNN of the new enclosure.
Record the serial number of the enclosure, which is needed in later steps.

Enter the following command to verify that the enclosure is detected on the fabric:

# svcinfo lscontrolenclosurecandidate
serial_number product_MTM
66G00C2       2076-624

Enter this command to determine the I/O group where the enclosure must be added:
```
lsiogrp
```
Record the name or ID of the first I/O group that has a node count of zero. You will need the ID for the next step.
Enter this command to add the enclosure to the system:
```
addcontrolenclosure  -iogrp iogrp_name | iogrp_id -sernum enclosureserialnumber
```
where iogrp_name | iogrp_id is the name or ID of the I/O group and enclosureserialnumber is the serial number of the enclosure.
Note: This step might take a considerable amount of time.
Record this information for future reference:
- Serial number.
- Worldwide node name of both node canisters.
- All of the worldwide port names.
- The name or ID of the I/O group that contains the enclosure.
Enter this command to verify that the node canisters in the enclosure are online:
```
lsnodecanister
```