HA_MODE_SHARED and HA_MODE_SHARED_PAIR are ha_mode flags available in Avi Load Balancer CLI under serviceenginegroup properties. This section explains the purpose of the HA modes and how to configure the options.
The HA_MODE_SHARED option is equivalent to the N+M elastic HA option available in the Avi Load Balancer UI. In this mode, each virtual service is typically placed on one Service Engine unless the scaleout-per-vs setting is changed to two or more.
The HA_MODE_SHARED_PAIR option is equivalent to active/active elastic HA mode available in the Avi Load Balancer UI. In active/active HA mode, Avi Load Balancer places each virtual service on more than one SE, as specified by the min_scaleout_per_vs parameter. The default value for the parameter min_scaleout_per_vs is 2. The value for min_scaleout_per_vs is changed through Avi Load Balancer CLI.
| Field | Value | +---------------------------------------+---------------------------------------------------------+ | uuid | serviceenginegroup-5d061595-426f-48bf-9683-a3ca95a5f1dd | | name | Default-Group | | max_vs_per_se | 10 | | min_scaleout_per_vs | 2 | | max_scaleout_per_vs | 4 | | max_se | 10 | | vcpus_per_se | 2 | | memory_per_se | 2048 | | disk_per_se | 10 gb | | max_cpu_usage | 80 percent | | min_cpu_usage | 20 percent | | se_deprovision_delay | 120 min | | auto_rebalance | True | | se_name_prefix | SE1 | | vs_host_redundancy | True | | vcenter_folder | VM1 | | vcenter_datastores_include | False | | vcenter_datastore_mode | VCENTER_DATASTORE_ANY | | vcenter_clusters | | | cluster_refs[1] | N3K | | include | True | | cpu_reserve | False | | mem_reserve | True | | ha_mode | HA_MODE_SHARED
If the value for the flag HA_MODE_SHARED is set to true and the value for the flag min_scaleout_per_vs is set to 2, then HA mode will work like active/active elastic HA mode as one virtual service is placed on more than one SE.
Changing HA modes using Avi Load Balancer CLI
Use configure serviceenginegroup option to change HA modes on Avi Load Balancer.
[admin:Controller-2]: > configure serviceenginegroup Default-Group ha_mode
Changing HA modes using Avi Load Balancer UI
To change HA mode using Avi Load Balancer UI,
Navigate to .
Click the edit icon at the right side to select various options for HA mode, available under High Availability & Placement Setting.
The virtual service placement setting (compact and distributed) plays a very important role in spinning up SEs.
For more information on virtual service placement options on Avi Load Balancer and Elastic HA mode for Avi Load Balancer SEs, see Elastic High Availability for NSX Advanced Load Balancer Service Engines.
