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5.9 KiB
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41 lines
5.9 KiB
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:original_name: RedisDifference.html
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.. _RedisDifference:
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Comparing Redis Versions
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========================
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When creating a DCS Redis instance, you can select the cache engine version and the instance type.
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- **Version**
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DCS supports Redis 3.0, 4.0, and 5.0. The following table describes the differences between these versions.
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.. table:: **Table 1** Differences between Redis versions
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+----------------------------------------+-------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| Feature | Redis 3.0 | Redis 4.0 and Redis 5.0 |
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+========================================+=======================================================+==================================================================================================================================================================================================+
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| Instance deployment mode | Based on VMs | Containerized based on physical servers |
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+----------------------------------------+-------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| Time required for creating an instance | 3–15 minutes, or 10–30 minutes for cluster instances. | 8 seconds |
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+----------------------------------------+-------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| QPS | 100,000 QPS per node | 100,000 QPS per node |
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+----------------------------------------+-------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| Instance type | Single-node, master/standby, and Proxy Cluster | Single-node, master/standby and Redis Cluster |
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+----------------------------------------+-------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| Instance total memory | Ranges from 2 GB, 4 GB, 8 GB, to 1024 GB. | Regular specifications range from 2 GB, 4 GB, 8 GB, to 1024 GB. Small specifications, such as 128 MB, 256 MB, 512 MB, and 1 GB, are also available for single-node and master/standby instances. |
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+----------------------------------------+-------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| Scale-up or scale-down | Online scale-up and scale-down | Online scale-up and scale-down |
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+----------------------------------------+-------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| Backup and restoration | Supported for master/standby and cluster instances | Supported for master/standby and cluster instances |
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+----------------------------------------+-------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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.. note::
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The underlying architectures vary by Redis version. Once a Redis version is chosen, it cannot be changed. For example, you cannot upgrade a DCS Redis 3.0 instance to Redis 4.0 or 5.0. If you require a higher Redis version, create a new instance that meets your requirements and then migrate data from the old instance to the new one.
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- **Instance type**
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Select from single-node, master/standby, and cluster types. For details about their architectures and application scenarios, see :ref:`DCS Instance Types <dcs-pd-200312001>`.
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