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Copy file name to clipboardExpand all lines: articles/storage/elastic-san/elastic-san-planning.md
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@@ -42,7 +42,7 @@ Using the same example of a 100 TiB SAN that has 500,000 IOPS and 20,000 MB/s. S
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As a preview feature, you can automatically scale up your SAN by specific increments until a specified maximum size using an autoscale policy. An autoscale policy is helpful for environments where storage consumption continually increases, like environments using volume snapshots. Volume snapshots consume some of the total capacity of an elastic SAN, and having an autoscale policy helps ensure your SAN doesn't run out of space to store volume snapshots.
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When setting an autoscale policy, there's a minimum capacity increment of 1 TiB, and you can only automatically scale additional capacity, rather than base capacity. So when autoscaling, the IOPS and throughput of your SAN won't automatically scale up.
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When setting an autoscale policy, there's a minimum capacity increment of 1 TiB, and you can only automatically scale additional capacity, rather than base capacity. So when autoscaling, the IOPS and throughput of your SAN doesn't automatically scale up.
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Here's an example of how an autoscale policy works. Say you have an elastic SAN that has 100 TiB total storage capacity. This SAN has volume snapshots configured, so you want the capacity to automatically scale to accommodate your snapshots. You can set a policy so that whenever the unused capacity is less than or equal to 20 TiB, additional capacity on your SAN increases by 5 TiB, up to a maximum of 150 TiB total storage. So, if you use 80 TiB of space, it automatically provisions an additional 5 TiB, so your SAN now has a total storage capacity of 105 TiB.
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## Redundancy
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To protect the data in your Elastic SAN against data loss or corruption, all SANs store multiple copies of each file as they're written. Depending on the requirements of your workload, you can select additional degrees of redundancy. Two data redundancy options are currently supported.
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To protect the data in your Elastic SAN against data loss or corruption, all SAN store multiple copies of each file as they're written. Depending on the requirements of your workload, you can select additional degrees of redundancy. Two data redundancy options are currently supported.
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### Locally-redundant storage
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With Locally-redundant storage (LRS), every SAN is stored three times within an Azure storage cluster. This protects against loss of data due to hardware faults, such as a bad disk drive. However, if a disaster such as fire or flooding occurs within the data center, all replicas of an Elastic SAN using LRS could be lost or unrecoverable.
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With Locallyredundant storage (LRS), every SAN is stored three times within an Azure storage cluster. This protects against loss of data due to hardware faults, such as a bad disk drive. However, if a disaster such as fire or flooding occurs within the data center, all replicas of an Elastic SAN using LRS could be lost or unrecoverable.
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