Tair (Redis® OSS-Compatible):Manually increase the bandwidth of an instance

Scenarios

The bandwidth of an instance varies based on the instance type. If the traffic of an instance reaches the allocated bandwidth, network congestion may occur and instance performance may deteriorate. In the following scenarios, you can adjust the bandwidth of an instance to prevent network congestion and performance deterioration. A bandwidth adjustment helps you increase bandwidth without transient connections at lower costs than an instance specification change.

Precautions

• The bandwidth of an instance or a shard can be increased by up to six times the default bandwidth of the instance, but the increase in bandwidth cannot exceed 192 Mbit/s. For example, if the default bandwidth of a Tair DRAM-based master-replica instance equipped with 2 GB of memory is 96 Mbit/s, you can increase the bandwidth of the instance by up to 192 Mbit/s. As a result, the maximum bandwidth of the instance is 288 Mbit/s. If the default bandwidth of a Redis Open-Source Edition master-replica instance equipped with 256 MB of memory is 10 Mbit/s, you can increase the bandwidth of the instance by up to 60 Mbit/s. As a result, the maximum bandwidth of the instance is 70 Mbit/s.

  To further increase the bandwidth of the instance, you can upgrade the instance specifications or instance architecture. For example, you can change the standard architecture to the cluster architecture. For more information, see Overview.

• If you perform one of the following operations, the purchased extra bandwidth automatically becomes invalid and your money is refunded. You can re-increase the bandwidth of your instance based on your business requirements.

  Operation	Exception
  Upgrade the major version	N/A
  Change the configurations of an instance	If the instance uses the standard architecture, the bandwidth settings remain valid after you change the configurations of the instance.
  Migrate an instance across zones	If the instance uses the standard architecture, the bandwidth settings remain valid after you migrate the instance across zones.

Billing

You are charged per hour based on the amount and usage duration of the extra bandwidth that you purchase. The fees vary based on the region that you select. For more information, see Billable items.

Procedure

1. Log on to the console and go to the Instances page. In the top navigation bar, select the region in which the instance that you want to manage resides. Then, find the instance and click the instance ID.

2. In the Configuration Information section, click Modify to the right of Maximum Internal Bandwidth.

   Note

   • In the Configuration Information section, you can view the maximum internal bandwidth of the instance. If the instance is a cluster or read/write splitting instance, the bandwidth is the sum of the bandwidths that are allocated to all data nodes within the instance.

   • During off-peak hours, you can reduce the bandwidth to save resources and reduce costs. For more information about how to view the traffic usage of an instance, see View performance monitoring data.

3. In the panel that appears, specify the amount of the extra bandwidth that you want to purchase and click OK.

   Key parameter

   Description

   Bandwidth

   The extra bandwidth that you want to purchase. The bandwidth of an instance can be increased up to six times the maximum bandwidth available for the instance type. For more information about the maximum bandwidths available for various instance types, see Overview. The extra bandwidth that you can select varies based on the instance type. If the instance is a standard instance, adjust the bandwidth of the instance. If the instance is a cluster or read/write splitting instance, select one of the following options: Total Shard Bandwidth: allows you to adjust the bandwidths of all data shards within the instance at the same time. For example, if you want to handle traffic spikes during events such as flash sales, you can select this option to increase bandwidths. Selected Shard Bandwidth: allows you to adjust the bandwidths of one or more specific data shards. For example, if you want to handle request skew issues, you can select this option to adjust the bandwidths of the selected data shards based on how requests are skewed. Note You can use the diagnostic report feature to analyze whether request skew issues occur on an instance. For more information, see Create a diagnostic report.

4. Click Pay and complete the payment.

   After you complete the payment, wait for about 1 minute. Then, the maximum bandwidth of the instance is updated to the sum of the existing bandwidth and the extra bandwidth that you purchase.

   If you want to unsubscribe from the purchased extra bandwidth, you can adjust the bandwidth by following the preceding steps and then click Pay.

What to do next

• We recommend that you use the bandwidth auto scaling feature. If you enable this feature, when the bandwidth usage of an instance reaches the specified threshold, the bandwidth is automatically increased or decreased. This feature reduces costs and facilitates O&M. For more information, see Enable bandwidth auto scaling.

• If the instance is a Redis Open-Source Edition instance that requires a sharp bandwidth increase, we recommend that you change the instance into a Tair (Enterprise Edition) instance. This is because a Tair instance supports a maximum bandwidth of more than 96 Mbit/s.

Related API operations