High availability

The Image Streamer appliance works in clustered appliance device pairs, to achieve high availability. Each logical enclosure in a high availability (HA) configuration must have two interconnected Image Streamer appliances.

From a storage perspective (storage for the active OS volumes, golden volumes, and artifacts), each Image Streamer appliance pair has an active-active configuration. The components that support storage of OS volumes are always active in every Image Streamer appliance pair, providing a continuous connection between compute modules and its boot/run OS volume.

From a management perspective, one appliance in the pair is active and the other is standby, meaning that if there is a failure in the active appliance, the standby appliance assumes control, protecting against data loss (management data and audit log).

In configurations where Image Streamer appliances are used in multiple logical enclosures, many appliance pairs are formed. One appliance pair is designated as the primary appliance pair and the rest are designated as secondary appliance pairs.

If a failure occurs in the primary appliance pair, you can designate any of the secondary appliance pairs as the new primary appliance pair. HPE OneView will update the information and provide a link to the Image Streamer user interface on the newly designated primary appliance pair.

For more information on designating a secondary appliance pair as a primary appliance pair, see Change the deployment appliance for an Image Streamer OS deployment server in HPE OneView Help.