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# Understanding the impact of future configuration changes

To understand the impact of making significant changes to your environment, see the following topics:

- Configuration changes that require or result in resource outages

- Configuration changes that might require changes to multiple resources

## Configuration changes that require or result in resource outages

#### Appliance

Taking an appliance offline does not affect the managed resources—they continue to operate while the appliance is offline.

In an appliance cluster, HPE OneView is taken offline temporarily by an activate standby operation. HPE OneView resumes operation after the standby appliance becomes the active appliance.

When you install an appliance update, the appliance restarts and goes offline.

#### Enclosures

The Onboard Administrator (OA) is taken offline automatically during an enclosure firmware update.

#### Interconnects and logical interconnects

- Server profile connections to networks in an uplink set are taken offline when you delete the uplink set.

- Server profile connections to networks in an uplink set can be interrupted for a few seconds when you change the name of an uplink set using either of these methods:

  - Change the name of the uplink set in the logical interconnect.

  - Change the name of the uplink set in the logical interconnect group, and then update the logical interconnect from the logical interconnect group.

- An interconnect is taken offline when you:

  - Update or activate firmware for a logical interconnect. Staging firmware does not require interconnects be taken offline.

  - Update firmware for an enclosure and select the option to update the enclosure, logical interconnect, and server profiles.

- If an interconnect has firmware that has been staged but not activated, any subsequent reboot of that interconnect activates the firmware, which takes the interconnect offline.

- You can prevent the loss of network connectivity for servers connected to a logical interconnect that has a stacking mode of `Enclosure` and a stacking health of `Redundantly Connected` by updating firmware using the following method:

  1. Staging the firmware on the logical interconnect.

  2. Activating the firmware for the interconnects in even-numbered enclosure bays.

  3. Waiting until the firmware update to complete and the interconnects are in the `Configured` state.

  4. Activating the firmware for the interconnects in the odd-numbered enclosure bays.

#### Networks

- If you attempt to delete a network that is in use by one or more server profiles, the appliance warns you that the network is in use. If you delete the network while it is in use, server profile connections that specify the network explicitly (instead of as part of a network set) are taken offline.

  If you add a network with the same name as the network you deleted, connections that specify the network explicitly (instead of as part of a network set) are not updated—you must edit each server profile connection to reconfigure it to specify the network you added. Because you must edit the server profile to edit the connection, you must power off the server.

- If you attempt to delete a network that is a member of a network set, the appliance warns you that the network is assigned to at least one network set. If you delete that network and there are other networks in that network set, server profile connectivity to the deleted network is taken offline, but connectivity to other networks in the network set is unaffected.

  You can add a network to a network set, including a network that has the same name as a network you deleted, while server profile connections to that network set remain online.

#### Network sets

- If you attempt to delete a network set that is in use by one or more server profiles, the appliance warns you that the network set is in use. If you delete the network set while it is in use, server profile connections to that network set are taken offline.

- If you add a network set with the same name as the network you deleted, connections that specify the network set are not updated—you must edit each server profile connection to reconfigure it to specify the network set you added. Because you must edit the server profile to edit the connection, you must power off the server.

- Server profiles with connections to a network set can be affected when a network in the network set is deleted. See “Networks”.

#### Server profiles and server hardware

- Before you edit a server profile, you might need to power down the server hardware to which the server profile is assigned. See About editing a server profile for a list of edits that can be performed without powering down the server hardware.

- Firmware updates require that you edit the server profile to change the firmware baseline. As with any other edits to server profiles, you must power down the server hardware to which the server profile is assigned before you edit a server profile.

- Server profiles and server hardware can be affected by changes to networks and network sets. For more information, see “Networks” and “Network sets”.

- Server profiles and server hardware can be affected by changes to the names of uplink sets. For more information, see “Interconnects and logical interconnects”.

## Configuration changes that might require changes to multiple resources

- Adding a network

- Adding an enclosure

### Adding a network

When you add a network to the appliance, you might need to make configuration changes to the following resources:

- Networks. Add the network.

- Network Sets. (Optional) If the network you are adding is an Ethernet network you might want to add it to a network set or create a network set that includes the network.

- Logical Interconnects and Logical Interconnect Groups. For a server connected to a logical interconnect to access a network, the logical interconnect must have an uplink set that includes a connection to that network:

  - You might need to update multiple logical interconnects.

  - You can make configuration changes to the logical interconnect group, and then update each logical interconnect from the group.

  - If your configuration changes include deleting an uplink set or changing the name of an uplink set, server profile network connectivity can be affected. See Configuration changes that require or result in resource outages.

- Server Profiles. If the server profile does not have a connection to a network set that includes this network, you must add connections to the network.

For a summary of the tasks you complete when adding a network, see Quick Start: Add a network and associate it with an existing server.

### Adding an enclosure

When you add an enclosure to be managed by the appliance, you might need to make configuration changes to the following resources:

- Enclosures. Add the enclosure to be managed.

- Enclosure Groups. Every managed enclosure must be a member of an enclosure group. If you do not choose an existing enclosure group, you must create one when you add the enclosure.

- Logical Enclosures. Logical enclosures maintain configurations of enclosures that are linked together. Use logical enclosures for firmware updates, OA scripting, and making the enclosures consistent with changes made from the enclosure group.

- Logical Interconnects and Logical Interconnect Groups. Logical interconnects and logical interconnect groups define the network connectivity for the managed enclosure. Enclosure groups must specify a logical interconnect group. When you create an enclosure group, if you do not specify an existing logical interconnect group, you must create one. For a server connected to a logical interconnect to access a network, the logical interconnect group you create must have an uplink set that includes a connection to that network.

- Server Profiles. Adding and assigning server profiles to the server blades in the managed enclosure is not required at the time you add the enclosure, but to use the server blades in a managed enclosure, you must assign server profiles to them. To access a network, the server profile must include a connection to that network or a network set that includes that network.

See also

- Quick Start: Initial configuration of HPE OneView

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