Resilience

AOM provides multiple reliability DR capabilities. Technical solutions (such as intra-AZ instance DR, cross-AZ DR, cross-cluster DR, and multiple data copies) ensure service durability and reliability.

**Table 1** Reliability architecture of AOM
Reliability Solution	Description
Intra-AZ instance DR	In a single AZ, multiple instances are used for DR. Faulty nodes can be quickly detected and remaining instances can still provide services.
Multi-AZ DR	AOM supports cross-AZ DR. When an AZ is abnormal, instances in other AZs can still provide services.
Cross-cluster DR	AOM supports cross-cluster DR. When one cluster is abnormal, AOM can continue to provide services.
Data DR	AOM configuration, metric, and alarm data is stored in multiple copies to ensure data reliability.

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