Will Audit Data Be Lost If I Expand or Upgrade a CBH Instance?
In normal cases, the audit data will not be lost when you expand a CBH instance or upgrade the system of a CBH system.
However, capacity expansion and upgrade might fail. Before expansion and upgrade, back up data to prevent data loss due to capacity expansion or upgrade failures.
Precautions for Upgrade
- Before the expansion
To prevent data loss in case of an expansion failure, back up data in the mapped CBH system before the upgrade. For details, see How Do I Back Up CBH System Data?
Ensure that the current version of the CBH system is 3.2.16.0 or later if you want to upgrade the instance from standard to professional. Otherwise, the enhanced functions remain unavailable after the capacity expansion. If the CBH system version is earlier than 3.2.16.0, upgrade the system version first. For details about how to view the CBH system version, see About System.
- During the expansion
It takes about 30 minutes for capacity expansion. During this period, the CBH system is unavailable, but services running on the managed hosts are not affected. To avoid data loss, you are not advised to log in to the CBH instance for any operations during the expansion.
- After the expansion
Only data disks are expanded. Thus, system disks are not affected. After the capacity is expanded, the system expands the CPU, memory, and bandwidth for you, which does not affect the use of the original EIP.
Precautions for Expansion
- Before the upgrade
Back up CBH system data to prevent the upgrade failure from affecting services. For details, see How Do I Back Up Data of the CBH System?
- During the upgrade
The version upgrade takes about 30 minutes. Although the CBH system is unavailable during this period, there is no impacts on host resources managed on the instance. However, to prevent important data loss, you are not advised to log in to the CBH system during the version upgrade.
- After the upgrade
The CBH instance automatically restarts after the upgrade completes. You can then use the mapped CBH system.
After the upgrade, you can use the configuration and storage data of the original CBH system. Version upgrading does not affect the original configuration and storage data of the CBH system.
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