You can operate DR-based hot swap or hot expansion in the following cases:
When an insignificant failure (such as 1 bit intermittent error) that does not disrupt ongoing operations occurs in the CPU or memory.
When the system board must be added, removed, or moved due to business expansion or reduction.
Note
To replace, move, or remove the system board, it is necessary to verify whether the reduced CPU or memory does not affect the operations in advance.
Estimate in advance how long the system will be suspended due to the DR operation.
If you perform DR when the operations are being suspended, the system will be stopped. To avoid the system stop, the failover or failback of the operations must be done to make them continuous on the node where DR is not performed.
When performing DR on an operation node, you need to change the timeout value of CF. If DR is not completed within this changed timeout value, the node state becomes LEFTCLUSTER. In this case, the node is not switched automatically.
If you have a plan to use DR, make sure to perform the following DR process test in the stage of building cluster system to verify that DR does not cause any problems.
