Description: It is very important to know what the average daily change rate is for your active server. The average daily change rate is the average amount of new changes that occurs on the active server on any given day. Based on this value you will need a certain amount of bandwidth to keep the servers in sync at all times so it is important to know this value before purchasing your WAN link.
Solution: There are a few different ways to determine the amount of changes occuring on the active server:
1. Run your scenario in assessment mode. Assessment mode does not sync or replicate any data, all it does is keep track of the amount of changes occuring on the master in the root directories included in your scenario. When you stop the assessment mode scenario it generates an assessment report which details the amount of changes that occured while the scenario was running. To run your scenario in assessment mode you would choose the purple run button instead of the green run button:
I would run the scenario for at least a few business days so you can collect some data. When you stop the scenario it should generate the assessment report which can be accessed by going to the report center on the overview page. You can also click on 'tools' , 'reports', 'show scenario reports' to access the assessment mode.
2. The 2nd way to track changes on the master would be to turn on replication reporting, this is off by default. To turn this on, in the left hand pane of the scenario manager expand the scenario and click on the master, then in the right hand pane click on the properties tab, then expand 'reports', then turn replication reporting 'on'. After you do this a couple more options will appear, be sure to change the 'Generation Frequency' from 1 hour to 24, this way you get 1 report per day instead of 24. If you want to know which files changed and at what times you can turn the detailed reporting option on as well, it is important to remember that if you have many files that are frequently changing this detailed option can make the reports very large. If you have reports setup to be emailed and the reports become too large it may fail to get emailed due to an attachment size limit being reached.
This report will not start to be created till synchronization has finished. The longer you can run the scenario and the more replication reports you can generate the better. The more replication reports you have the more accurate your average daily change rate will be. Each report will have a line that lists the total amount of changes that occured during that report time frame, you can add this value up from each report and then divide by the number of reports you have to get the average daily change rate. For more information on replication reports: https://arcserve.zendesk.com/hc/en-us/articles/202046019
3. The 3rd way to find the change rate occuring is by monitoring a value that appears in the RHA scenario manager. For more info on this, please review the following kb: https://arcserve.zendesk.com/hc/en-us/articles/202807155