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# High availability (Reliability) in Azure Cosmos DB for NoSQL
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This article describes high availability (reliability) support in Azure CosmosDB for NoSQL and covers both [availability zones](#availability-zone-support), as well as [cross-region disaster recovery and business continuity](#cross-region-disaster-recovery-and-business-continuity).
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This article describes high availability (reliability) support in Azure Cosmos DB for NoSQL and covers both [availability zones](#availability-zone-support), as well as [cross-region disaster recovery and business continuity](#cross-region-disaster-recovery-and-business-continuity).
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## Availability zone support
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### SLA improvements
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Because availability zones are physically separate and provide distinct power source, network, and cooling, Availability SLAs (Service-level agreements) are higher (99.995%) than accounts with a single region (99.99%). Regions where availability zones are enabled are charged at 25% premium, while those without those without availability zones don't incur the premium. Moreover, the premium pricing for availability zones is waived for accounts configured with multi-region writes and/or for collections configured with autoscale mode.
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Because availability zones are physically separate and provide distinct power source, network, and cooling, Availability SLAs (Service-level agreements) are higher (99.995%) than accounts with a single region (99.99%). Regions where availability zones are enabled are charged at 25% premium, while those without availability zones don't incur the premium. Moreover, the premium pricing for availability zones is waived for accounts configured with multi-region writes and/or for collections configured with autoscale mode.
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Adding an additional region to Cosmos DB account typically increases existing bill by 100% (additively not multiplicatively) though small variations in cost across regions exist. For more details, see [pricing page](https://azure.microsoft.com/pricing/details/cosmos-db/autoscale-provisioned/).
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Enabling AZs, adding additional region(s), or turning on multi-region writes can be thought as a layering approach that increases resiliency and availability of a given Cosmos DB account at each step of the way - from 4 9's availability for single region no-AZ configuration, through 4 and half 9's for single region with AZs, all the way to 5 9's of availability for multi-region configuration with the multi-region write option enabled. Please refer the following table for a summary of SLAs for each configuration.
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Enabling AZs, adding additional region(s), or turning on multi-region writes can be thought as a layering approach that increases resiliency and availability of a given Cosmos DB account at each step of the way - from 4 9's availability for single region no-AZ configuration, through 4 and half 9's for single region with AZs, all the way to 5 9's of availability for multi-region configuration with the multi-region write option enabled. Please refer to the following table for a summary of SLAs for each configuration.
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|KPI|Single-region writes without availability zones|Single-region writes with availability zones|Multiple-region, single-region writes without availability zones|Multiple-region, single-region writes with availability zones|Multiple-region, multiple-region writes with or without availability zones|
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