What is the minimum size of a Journal when using Distributed Consistency Groups?

For Distributed Consistency Groups in a Dell RecoverPoint environment, the minimum size required

for each journal volume is 40 GB. This is the minimum per copy, which can be a single LUN or

multiple LUNs that add up to at least 40 GB1.

The size of the journal is determined by the write change rate of what is being replicated and the

protection window required per Consistency Group. A general rule of thumb is about 15-20% of the

total amount of data being replicated. For example, if a Distributed Consistency Group (DCG) has

production server LUNs totaling 500 GB, then the journal per copy would be about 100 GB following

this rule1.

It’s important to note that while 40 GB is the minimum, the actual size may need to be larger

depending on the specific requirements and write change rate of the environment. The journal size

should be sufficient to handle the data changes and provide the necessary protection window1.