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adding failover note to table of redundancy options
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‎articles/storage/common/storage-redundancy.md

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@@ -138,18 +138,20 @@ The following table shows how durable and available your data is in a given scen
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| Scenario | LRS | ZRS | GRS/RA-GRS | GZRS/RA-GZRS |
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| :------------------------------------------------------------------------------------------------------- | :------------------------------ | :------------------------------- | :----------------------------------- | :----------------------------------- |
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| A node within a data center becomes unavailable | Yes | Yes | Yes | Yes |
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| An entire data center (zonal or non-zonal) becomes unavailable | No | Yes | Yes | Yes |
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| A region-wide outage occurs | No | No | Yes | Yes |
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| A node within a data center becomes unavailable | Yes | Yes | Yes<sup>1</sup> | Yes |
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| An entire data center (zonal or non-zonal) becomes unavailable | No | Yes | Yes<sup>1</sup> | Yes |
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| A region-wide outage occurs | No | No | Yes<sup>1</sup> | Yes |
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| Read access to data in the secondary region if the primary region becomes unavailable | No | No | Yes (with RA-GRS) | Yes (with RA-GZRS) |
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| Percent durability of objects over a given year<sup>1</sup> | at least 99.999999999% (11 9's) | at least 99.9999999999% (12 9's) | at least 99.99999999999999% (16 9's) | at least 99.99999999999999% (16 9's) |
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| Supported storage account types<sup>2</sup> | GPv2, GPv1, BlockBlobStorage, BlobStorage, FileStorage | GPv2, BlockBlobStorage, FileStorage | GPv2, GPv1, BlobStorage | GPv2 |
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| Availability SLA for read requests<sup>1</sup> | At least 99.9% (99% for cool access tier) | At least 99.9% (99% for cool access tier) | At least 99.9% (99% for cool access tier) for GRS<br /><br />At least 99.99% (99.9% for cool access tier) for RA-GRS | At least 99.9% (99% for cool access tier) for GZRS<br /><br />At least 99.99% (99.9% for cool access tier) for RA-GZRS |
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| Availability SLA for write requests<sup>1</sup> | At least 99.9% (99% for cool access tier) | At least 99.9% (99% for cool access tier) | At least 99.9% (99% for cool access tier) | At least 99.9% (99% for cool access tier) |
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| Percent durability of objects over a given year<sup>2</sup> | at least 99.999999999% (11 9's) | at least 99.9999999999% (12 9's) | at least 99.99999999999999% (16 9's) | at least 99.99999999999999% (16 9's) |
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| Supported storage account types<sup>3</sup> | GPv2, GPv1, BlockBlobStorage, BlobStorage, FileStorage | GPv2, BlockBlobStorage, FileStorage | GPv2, GPv1, BlobStorage | GPv2 |
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| Availability SLA for read requests<sup>2</sup> | At least 99.9% (99% for cool access tier) | At least 99.9% (99% for cool access tier) | At least 99.9% (99% for cool access tier) for GRS<br /><br />At least 99.99% (99.9% for cool access tier) for RA-GRS | At least 99.9% (99% for cool access tier) for GZRS<br /><br />At least 99.99% (99.9% for cool access tier) for RA-GZRS |
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| Availability SLA for write requests<sup>2</sup> | At least 99.9% (99% for cool access tier) | At least 99.9% (99% for cool access tier) | At least 99.9% (99% for cool access tier) | At least 99.9% (99% for cool access tier) |
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<sup>1</sup> For information about Azure Storage guarantees for durability and availability, see the [Azure Storage SLA](https://azure.microsoft.com/support/legal/sla/storage/).
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<sup>1</sup> Account failover is required if the primary region becomes unavailable. For more information, see [Disaster recovery and storage account failover](storage-disaster-recovery-guidance.md).
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<sup>2</sup> For information for storage account types, see [Storage account overview](storage-account-overview.md).
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<sup>2</sup> For information about Azure Storage guarantees for durability and availability, see the [Azure Storage SLA](https://azure.microsoft.com/support/legal/sla/storage/).
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<sup>3</sup> For information for storage account types, see [Storage account overview](storage-account-overview.md).
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All data for all types of storage accounts is copied according to the redundancy option for the storage account. Objects including block blobs, append blobs, page blobs, queues, tables, and files are copied. Data in all tiers, including the archive tier, is copied. For more information about blob tiers, see [Azure Blob storage: hot, cool, and archive access tiers](../blobs/storage-blob-storage-tiers.md).
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