Introduction
If you are deploying business-critical applications in Oracle Cloud Infrastructure (OCI), it’s crucial to understand and leverage the availability SLA (Service Level Agreement) provided by OCI for optimal uptime and reliability. OCI’s SLA varies based on the deployment strategy you choose:
Deployment across Availability Domains: OCI offers a 99.99% availability SLA when you deploy two or more Virtual Machines (VMs) across different Availability Domains within the same OCI region.
Deployment across Fault Domains: If you deploy VMs across Fault Domains, OCI provides a 99.95% availability SLA. It is important to note that not every OCI region has multiple Availability Domains, so in some regions, deployments across Fault Domains will be your only option.
Single VM Deployment: For deployments involving a single VM, the SLA stands at 99.9%.
This framework means that OCI guarantees a certain level of external connectivity based on how you deploy your VMs:
It’s important to note that the SLA covers the availability of the VM itself, not the applications or services running on it. To ensure application availability, additional measures such as application monitoring, recovery planning, data replication, and transactional replication (for databases like SQL Server) are necessary. Strategies might include load balancing, clustering, or data replication to manage application availability effectively.
To meet the criteria for the 99.99% availability SLA in OCI, it’s essential to deploy your VMs across multiple Availability Domains. This post will guide you on designing your OCI infrastructure to facilitate SQL Server that spans Availability Domains, ensuring maximum uptime and reliability for your critical business applications.
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