High availability

The Image Streamer appliance works in clustered appliance device pairs, which to achieve high availability.

High availability from a storage perspective (Storage for OS volumes and artifacts)

The Image Streamer appliance uses a virtual storage appliance to provide an Active-Active storage cluster for the compute modules. This Active-Active cluster uses an active-standby data path for the OS volumes that achieves high availability of OS volumes. The Image Streamer appliance uses alerts to notify the user, when any of the storage nodes in the cluster is not available.

High availability from a management perspective (Management of appliance and artifacts)

An HPE Synergy Composer domain can have multiple Image Streamer appliance pairs. An Image Streamer appliance pair serves a single logical enclosure, and a single logical enclosure can have at most one Image Streamer appliance pair. One of the Image Streamer appliance pair is designated as the primary appliance, and all other appliance pairs are designated as secondary appliances.

An Image Streamer appliance works as an Active-Standby appliance pair to achieve high-availability for appliance and artifact management through the user interface. If an active appliance fails, the standby appliance in the appliance pair can take over the user interface and artifact management in less than 3 minutes. If both the active and standby appliances of the primary appliance fail, then one of the available secondary appliances must be designated as the new primary appliance. To view the details of active and standby appliances in an appliance pair, navigate to the Deployment Appliances page on the Image Streamer user interface.

The Image Streamer appliance uses alerts to notify the user when the appliance is not highly available.