Help Center/ Distributed Cache Service/ User Guide/ Changing an Instance/ Adjusting DCS Instance Bandwidth
Updated on 2024-12-12 GMT+08:00
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Adjusting DCS Instance Bandwidth

Generally, Redis instances save and obtain data in the data layer closer to application services, which consumes the network bandwidth. Rate limits may occur when the instance bandwidth is insufficient, causing increased service latency or client connection exceptions. Currently, the Redis instance bandwidth can be adjusted on the console for DCS Redis 4.0 and later instances.

Notes and Constraints

  • This function is unavailable for professional edition DCS Redis instances.
  • This function is available only for instances in the Running state.
  • The bandwidth adjustment range is from the instance's assured bandwidth to its maximum bandwidth. Generally, the maximum bandwidth per shard is 2048 Mbit/s when the physical machine of the instance node has sufficient bandwidths.
  • The relationship between the instance bandwidth and the bandwidth of a single shard is as follows:
    • Bandwidth of single-node or master/standby instances = Bandwidth per shard
    • Bandwidth of read/write splitting instances = Bandwidth per shard × Replica quantity
    • Bandwidth of cluster instances = Bandwidth per shard × Shard quantity, or the total bandwidth of all shards if the bandwidth per shard varies

Procedure

  1. Log in to the management console, and choose Application > Distributed Cache Service in the service list.
  2. Click in the upper left corner of the management console and select the region where your instance is located.
  3. In the navigation pane, choose Cache Manager.
  4. On the Cache Manager page, click the name of the DCS instance you want to configure.
  5. In the Instance Details area of the DCS instance, click Adjust Bandwidth next to Bandwidth.

    Figure 1 Adjusting bandwidth

  6. The Adjust Bandwidth page is displayed. Specify bandwidth.

    For cluster instances with multiple shards, adjust the bandwidth for each shard or select the desired shards and click Adjust Bandwidth.

    • Set the bandwidth to a multiple of 8 within the valid range. Otherwise, a value rounded down to a multiple of 8 will be automatically used after the order is submitted. For example, if you set the bandwidth to 801, 800 will be used instead.
    • Price shown on the change page is only the fee of the additional bandwidth.
    • The additional bandwidth is pay-per-use.
    • You can adjust the bandwidth whenever as required. If you perform multiple bandwidth changes in a billing period (one hour), you will be billed according to highest bandwidth in the period. For example, if you have changed the bandwidth of a DCS Redis instance from 256 Mbit/s (default) to 2048 Mbit/s, and changed the bandwidth again to 512 Mbit/s in the same billing period, you will be billed at the price of 2048 Mbit/s bandwidth.

  7. Confirm the bandwidth and fees, check Authorization, and click Submit.

    When the bandwidth adjustment task is in the Successful state, the new bandwidth is used.

Parent topic: Changing an Instance