Powering off a control enclosure

To service a control enclosure, you must first safely power off both of the node canisters in the enclosure.

Host connectivity for hosts that are connected to the control enclosure is lost when the control enclosure is shut down. You must quiesce I/O activity of these hosts before you begin out this procedure.

If your system has a single control enclosure, complete the steps in Procedure: Powering off your system instead of following this procedure. Doing so provides a more coordinated shutdown of the whole system.

Attention:

If your system is powered on and performing I/O operations, control enclosures must be powered off correctly to ensure that no data is lost. If possible, always use the fix procedures that are presented by the management GUI to manage and maintain your system. The fix procedures ensure that node canisters are powered off safely.
If the system includes two control enclosures, some volumes might become inaccessible when a control enclosure is shut down. Refer to Procedure: Understanding volume dependencies to determine whether it is appropriate to continue this procedure.
If you need to power off the node canister that is operating as the configuration node, power down the other node canister first, and then power down the configuration node. This sequence prevents two failovers from happening, reducing delays in powering off the control enclosure.

To power off a control enclosure, complete the following steps.

Use the management GUI to determine which two node canisters are in the control enclosure that is to be powered off.
Note whether one of the two nodes is the configuration node so that you can power it off second.
Go to the service assistant for the first node to be powered off.
On the home page, select the node canister to be powered off.
Use the Power off action to power off the canister.
Wait for the node to appear offline.
Repeat steps 2 through 5 on the second node canister in the enclosure that is to be powered off.
If another control enclosure in the system is online, the management GUI can be used to confirm that the node status of both nodes is offline.
The status LEDs on both canisters indicate that the node is powered off as described in Procedure: Understanding the system status LEDs.
Turn off the power to the enclosure and disconnect both power cables from the enclosure.

After you power off a control enclosure by using this procedure, you must physically reseat both node canisters of the control enclosure to power it back on. The procedure is described in Procedure: Reseating a node canister and requires physical access to the enclosure.