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DocumentationCloud Load BalancerOperation GuideCLB InstanceUpgrade to a LCU-supported instances
Upgrade to a LCU-supported instances
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Last updated: 2024-10-09 17:02:24
Upgrade to a LCU-supported instances
Last updated: 2024-10-09 17:02:24
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CLB provides two types of instance specifications, shared instances and LCU-supported instances. By default, all CLB instances are shared instances when they are created. You can upgrade them to LCU-supported CLB instances.

Advantages of LCU-supported CLBs

A single shared instance can sustain up to 50,000 concurrent connections, 5,000 new connections per second, and 5,000 queries per second.
An LCU-supported instance supports up to Ten million concurrent connections, 1,000,000 new connections, and 300,000 QPS. You can submit a ticket to request for even higher capabilities.

Upgrade impact

Rate limiting
During the upgrade,The default bandwidth for intranet performance capacity instances corresponds to the upper limit of the specified configuration, which can be adjusted in the console after upgrading. The default bandwidth for public network performance capacity instances remains consistent with the pre-upgrade state, and can be modified in the console post-upgrade.
Upon upgrading, speed will be regulated according to the instance specifications. Exceeding these specifications will result in speed limitations and packet loss. For performance capacity type speed limitations, please refer to the following monitoring indicators. For more details, see Monitoring Metrics.
ClientConcurConn (Client-to-CLB concurrent connections)
ClientNewConn (Client-to-CLB new connections)
TotalReq (Requests per second)
ClientOuttraffic (Client-to-CLB bandwidth out)
ClientIntraffic (Client-to-CLB bandwidth in)
Existing connections will not be affected if the maximum capability of upgraded instances is not exceeded.
Billing
The billing mode remains unchanged.
The LCU fee will be billed based on the number of LCUs used per hour. For more details, see LCU Pricing.
Network connection
The upgrade does not interrupt network connections and can be completed within 1 minute.
Rollback
Degrading to shared CLB instances is not allowed.

Limitations

Upgrading multiple pay-as-you-go shared CLB instances is supported.
Upgrading classic CLB instances is not allowed.

How to Upgrade

1. Log in to the CLB console and click Instance management in the left sidebar.
2. Select a shared CLB instance from the list and click Upgrade to LCU-supported.

3. Click OK in the Upgrading to LCU-supported pop-up window.

See also

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