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  3. Planning and Architecture
  4. BlackBerry UEM and BEMS Planning Guide
  5. Designing a deployment plan for BlackBerry UEM
  6. High availability and disaster recovery

High availability and disaster recovery

It is important to understand the difference between high availability and disaster recovery.
High availability means that each service has some form of redundancy within a
BlackBerry UEM
 environment. For
BlackBerry UEM
, high availability is active-active. High availability could mean N+1 or N+N (where N is the number of servers for your environment as defined by the Performance Calculator), depending on how much fault tolerance is acceptable. All nodes in a high availability configuration exist within the same physical location and have minimal latency between nodes. In high availability, the database server is collocated (with low latency) to all online Core nodes. All running core nodes must be within 5ms of the database at all times (for more information, see Hardware requirements).
Disaster Recovery means servers located in an alternate physical site that can be failed over to in the event of a disaster in the primary site (complete site failure). Disaster recovery servers for
BlackBerry UEM
 must remain offline and must have a mirrored/clustered copy of the database in the disaster recovery site. Failing over to the disaster recovery site is "all or nothing". For example, if the database fails over, the
BlackBerry UEM
 Core servers also need to be brought up in the disaster recovery site and brought down in the primary site.