In disaster recovery (DR) tier classifications, often based on frameworks like theShare GrouporIBM’s DR tier model, the tiers represent increasing levels of recovery capability. Here’s a brief overview to explain:
Tier 1: Basic backup with offsite storage (e.g., tape backups), no real-time replication, and long recovery times.
Tier 2: Offsite backups with some improvements (e.g., electronic vaulting), but still no immediate recovery capability.
Tier 4: Point-in-time copies with more advanced backup solutions (e.g., disk-based replication), but typically lacks a fully operational hot site.
Tier 5: Transaction integrity with ahot site—a fully operational, mirrored site that can take over almost immediately with minimal data loss and downtime. Data is actively backed up and synchronized in real-time or near real-time.
Ahot siteis a fully equipped, operational duplicate of the primary site, ready to assume operations with little to no downtime. This capability aligns withTier 5, where data is backed up continuously or frequently, and the hot site ensures rapid recovery. Higher tiers (e.g., Tier 6 or 7) might involve zero data loss and instantaneous failover, but Tier 5 specifically fits the description of having a hot site with robust backup.
