To configure elastic HA for an SE group, follow the steps below:

  1. Navigate to Infrastructure > Clouds.

  2. Click the cloud name (for example, "Default-Cloud").

  3. Click Service Engine Group.

  4. Click the edit icon next to the SE group name, or click Create to create new one. Fill out the requisite fields.

  5. Click Save.

Notes and Recommendations

Virtual services are non-disruptive during SE upgrade, with one exception: Elastic HA, "N+M" buffer mode, for virtual services placed on just one SE (not scaled out). For more information refer to the article Upgrading NSX Advanced Load Balancer Software .

Elastic HA N + M mode (the default) is applied to applications that satisfy the conditions listed below:

  1. The SE performance required by any application can be delivered by a fraction of one SE's capacity. Hence, each virtual service is placed on a single SE.

  2. Applications can tolerate brief outages, though not longer than it takes to place a virtual service on an existing SE and plumb its network connections. This takes few seconds only.

The pre-existence of buffer SE capacity coupled with the default setting of Compact Placement ON speeds up the replacement of virtual services that are affected by a failure. The NSX Advanced Load Balancer does not wait for a substitute SE to spin up; it immediately places affected virtual services on spare capacity.

Most applications requirement for HA is satisfied by M=1. However, in either development or test environments, the M can be set to 0 as the developers or test engineers can wait for the new SE to spin up before the virtual service is back online.

Elastic HA active/active mode is applied to mission-critical applications where the virtual services must continue without interruption during the recovery period.

Additional Information

Difference between HA_MODE_SHARED and HA_MODE_SHARED_PAIR options available on Avi CLI