What is uptime guarantee percentage?
Here are the specific uptime percentages you can expect:
This is the highest level of availability for OCI Compute.
The Requirement: You must deploy your server instances across two or more Availability Domains (separate data centers) within a single region.
What it means: This allows for only about 4.38 minutes of unplanned downtime per month.
Best For: Mission-critical applications where even a few minutes of offline time results in significant revenue loss.
This is the standard for regions that may only have one physical data center or for users who want a simpler setup.
The Requirement: You must deploy your servers across two or more Fault Domains (isolated hardware racks) within a single Availability Domain.
What it means: This allows for roughly 21.92 minutes of unplanned downtime per month.
Best For: Most enterprise production workloads, web servers, and application tiers.
In 2026, OCI remains one of the few providers to offer a financially backed SLA for a single, non-redundant server instance.
The Requirement: This applies to any single VM or Bare Metal server using OCI Block Volumes as its boot disk.
What it means: Oracle guarantees that a single "rented" server will be up 99.9% of the time (~43 minutes of downtime per month).
| SLA Percentage | Redundancy Level | Max Downtime (Month) | Max Downtime (Year) |
| 99.99% | Multi-AD (2+ Data Centers) | ~4 Minutes | ~52 Minutes |
| 99.95% | Multi-FD (2+ Hardware Racks) | ~22 Minutes | ~4.4 Hours |
| 99.9% | Single Instance (No Redundancy) | ~43 Minutes | ~8.7 Hours |
It is important to remember that these percentages only cover Availability. In 2026, OCI is still unique for also providing:
99.9% Manageability SLA: Guarantees you can always use the API or Console to manage your servers.
99.9% Performance SLA: Guarantees that your server’s network and storage will perform at 90% or more of their advertised speeds.
Always Free Tier: Instances in the "Always Free" category (like the Ampere A1 shapes) do not have a financially backed SLA.
Preemptible Instances: If you "rent" servers at the 80% discount price (Spot instances), they are excluded because Oracle can reclaim them at any time.
Maintenance Windows: Legally, "Uptime" usually refers to unplanned downtime. Scheduled maintenance that Oracle announces in advance typically does not count against these percentages.