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to prevent data eviction but maintain high performance.
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Auto Tiering can extend your database across RAM and Flash Memory and intelligently manage "hot" (active) data in RAM and "cold" (less active) data in Flash memory (SSD).
Copy file name to clipboardExpand all lines: content/operate/rc/databases/create-database/create-pro-database-new.md
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@@ -130,7 +130,7 @@ The following settings are defined in the **Advanced options** of the **Setup**
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|**Public endpoint access**| Select whether or not to [block public endpoints]({{< relref "/operate/rc/security/database-security/block-public-endpoints" >}}) for all databases in the subscription. |
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|**VPC configuration**| Select **In a new VPC** to deploy to a new [virtual private cloud](https://en.wikipedia.org/wiki/Virtual_private_cloud) (VPC).<br/><br/>To deploy these databases to an existing virtual private cloud, select **In existing VPC** and then set VPC ID to the appropriate ID value.<br/><br/>(Available only if [Redis Cloud Bring your own Cloud]({{< relref "/operate/rc/subscriptions/bring-your-own-cloud" >}}) is enabled) |
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|**Deployment CIDR**| The [CIDR](https://en.wikipedia.org/wiki/Classless_Inter-Domain_Routing) range of IP addresses for your deployment. Redis creates a new [subnet](https://en.wikipedia.org/wiki/Subnetwork) for the **Deployment CIDR** in your [virtual private cloud](https://en.wikipedia.org/wiki/Virtual_private_cloud) (VPC). It cannot overlap with the CIDR ranges of other subnets used by your account.<br/><br/>For deployments in an existing VPC, the **Deployment CIDR** must be within your VPC's **primary** CIDR range (secondary CIDRs are not supported). |
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|**Auto Tiering**| Determines if your databases are stored only in memory (RAM) or are split between memory and Flash storage (RAM+Flash). See [Auto Tiering]({{< relref "/operate/rs/databases/auto-tiering/" >}})|
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|**Auto Tiering**| Determines if your databases are stored only in memory (RAM) or are split between memory and Flash storage (RAM+Flash). See [Auto Tiering]({{< relref "/operate/rs/databases/flash/" >}})|
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|**Maintenance windows**| Determines when Redis can perform [maintenance]({{< relref "/operate/rc/subscriptions/maintenance" >}}) on your databases. Select **Manual** if you want to set [manual maintenance windows]({{< relref "/operate/rc/subscriptions/maintenance/set-maintenance-windows" >}}). |
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When finished, choose **Continue** to determine your size requirements.
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@@ -63,7 +63,7 @@ with a custom certificate.
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1. Enter a path for [*Persistent storage*]({{< relref "/operate/rs/installing-upgrading/install/plan-deployment/persistent-ephemeral-storage" >}}),
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or leave the default path.
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1. To enable [*Auto Tiering*]({{< relref "/operate/rs/databases/auto-tiering/" >}}),
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1. To enable [*Redis Flex or Auto Tiering*]({{< relref "/operate/rs/databases/flash/" >}}),
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select **Enable flash storage** and enter the path to the flash storage.
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1. If the cluster is configured to support [rack-zone awareness]({{< relref "/operate/rs/clusters/configure/rack-zone-awareness.md" >}}), set the **Rack-zone ID** for the new node.
Copy file name to clipboardExpand all lines: content/operate/rs/clusters/new-cluster-setup.md
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1. Enter a path for [*Persistent storage*]({{< relref "/operate/rs/installing-upgrading/install/plan-deployment/persistent-ephemeral-storage" >}}),
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or leave the default path.
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1. To enable [*Auto Tiering*]({{< relref "/operate/rs/databases/auto-tiering/" >}}),
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1. To enable [*Redis Flex or Auto Tiering*]({{< relref "/operate/rs/databases/flash/" >}}),
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select **Enable flash storage** and enter the path to the flash storage.
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1. If the cluster is configured to support [rack-zone awareness]({{< relref "/operate/rs/clusters/configure/rack-zone-awareness.md" >}}), set the **Rack-zone ID** for the new node.
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configure Redis Enterprise Software on the node. See [Install and setup]({{< relref "/operate/rs/installing-upgrading" >}}) for more information.
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{{< note >}}
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If you are using [Auto Tiering]({{< relref "/operate/rs/databases/auto-tiering/" >}}), make sure the required flash storage is set up on this new node.
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If you are using [Redis Flex or Auto Tiering]({{< relref "/operate/rs/databases/flash/" >}}), make sure the required flash storage is set up on this new node.
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{{< /note >}}
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1.[Add the node]({{< relref "/operate/rs/clusters/add-node" >}}) to the cluster. Make sure the new node has as much available memory as the faulty
If an Active-Active database [runs on flash memory]({{<relref "/operate/rs/databases/auto-tiering">}}), you cannot add participating clusters that run on RAM only.
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If an Active-Active database [runs on flash memory]({{<relref "/operate/rs/databases/flash">}}), you cannot add participating clusters that run on RAM only.
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{{</note>}}
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1. Click **Join cluster** to add the cluster to the list of participating clusters.
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1. Enter a **Database name**.
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1. If your cluster supports [Auto Tiering]({{< relref "/operate/rs/databases/auto-tiering/" >}}), in **Runs on** you can select **Flash** so that your database uses Flash memory. We recommend that you use AOF every 1 sec for the best performance during the initial Active-Active database sync of a new replica.
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1. If your cluster supports [Redis Flex or Auto Tiering]({{< relref "/operate/rs/databases/flash/" >}}), in **Runs on** you can select **Flash** so that your database uses Flash memory. We recommend that you use AOF every 1 sec for the best performance during the initial Active-Active database sync of a new replica.
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1. To configure additional database settings, expand each relevant section to make changes.
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@@ -132,7 +132,7 @@ If you create a database with Auto Tiering enabled, you also need to set the RAM
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for this database. Minimum RAM is 10%. Maximum RAM is 50%.
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{{< /note >}}
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- **Memory eviction** - The default [eviction policy]({{<relref "/operate/rs/databases/memory-performance/eviction-policy">}}) for Active-Active databases is `noeviction`. Redis Enterprise versions 6.0.20 and later support all eviction policies for Active-Active databases, unless [Auto Tiering]({{<relref "/operate/rs/databases/auto-tiering">}}) is enabled.
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- **Memory eviction** - The default [eviction policy]({{<relref "/operate/rs/databases/memory-performance/eviction-policy">}}) for Active-Active databases is `noeviction`. Redis Enterprise versions 6.0.20 and later support all eviction policies for Active-Active databases, unless [Redis Flex or Auto Tiering]({{<relref "/operate/rs/databases/flash">}}) is enabled.
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- [**Capabilities**]({{< relref "/operate/oss_and_stack/stack-with-enterprise" >}}) (previously **Modules**) - When you create a new in-memory database, you can enable multiple Redis Stack capabilities in the database. For Auto Tiering databases, you can enable capabilities that support Auto Tiering. See [Redis Enterprise and Redis Stack feature compatibility
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]({{< relref "/operate/oss_and_stack/stack-with-enterprise/enterprise-capabilities" >}}) for compatibility details.
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## Eviction
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The default policy for Active-Active databases is _noeviction_ mode. Redis Enterprise version 6.0.20 and later support all eviction policies for Active-Active databases, unless [Auto Tiering]({{< relref "/operate/rs/databases/auto-tiering" >}})(previously known as Redis on Flash) is enabled.
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The default policy for Active-Active databases is _noeviction_ mode. Redis Enterprise version 6.0.20 and later support all eviction policies for Active-Active databases, unless [Redis Flex or Auto Tiering]({{< relref "/operate/rs/databases/flash" >}})(previously known as Redis on Flash) is enabled.
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For details, see [eviction for Active-Active databases]({{< relref "/operate/rs/databases/memory-performance/eviction-policy#active-active-database-eviction" >}}).
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The new instance does not accept write operations until it is in the syncing state.
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{{<note>}}
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If an Active-Active database [runs on flash memory]({{<relref "/operate/rs/databases/auto-tiering">}}), you cannot add participating clusters that run on RAM only.
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If an Active-Active database [runs on flash memory]({{<relref "/operate/rs/databases/flash">}}), you cannot add participating clusters that run on RAM only.
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{{</note>}}
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To add a new participating cluster to an existing Active-Active configuration using the Cluster Manager UI:
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You need at least [two participating clusters]({{< relref "/operate/rs/clusters/new-cluster-setup" >}}) for an Active-Active database. If your database requires more than ten participating clusters, contact Redis support. You can [add or remove participating clusters]({{< relref "/operate/rs/databases/active-active/manage#participating-clusters/" >}}) after database creation.
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{{<note>}}
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If an Active-Active database [runs on flash memory]({{<relref "/operate/rs/databases/auto-tiering">}}), you cannot add participating clusters that run on RAM only.
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If an Active-Active database [runs on flash memory]({{<relref "/operate/rs/databases/flash">}}), you cannot add participating clusters that run on RAM only.
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{{</note>}}
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Changes made from the Cluster Manager UI to an Active-Active database configuration only apply to the cluster you are editing. For global configuration changes across all clusters, use the `crdb-cli` command-line utility.
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- The `UNLINK` command is a blocking command for all types of keys.
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- Cross slot multi commands (such as `MSET`) are not supported with Active-Active databases.
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- The hashing policy can't be changed after database creation.
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- If an Active-Active database [runs on flash memory]({{<relref "/operate/rs/databases/auto-tiering">}}), you cannot add participating clusters that run on RAM only.
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- If an Active-Active database [runs on flash memory]({{<relref "/operate/rs/databases/flash">}}), you cannot add participating clusters that run on RAM only.
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