A quick upgrade is applicable to upgrade scenarios with the same host OS kernel version and is commonly used for upgrading a minor version to another of the same series (for example, 6.7.0_R2 > 6.7.0_R3) or upgrading one version to another released within a short period of time (for example, 6.7.0 > 6.8.0). Specifically, all physical nodes are directly upgraded without changing the run location and running status of VMs in the cluster. With the process active restart technology, a quick upgrade will only cause a business system jitter which will last for 3 seconds or shorter and will not interrupt the business system. A quick upgrade of the cluster takes a shorter time to complete.

A quick upgrade is mainly applicable to the following versions (and is commonly used for upgrading some of them):