How does using a date filter in MNE improve "phased" (staged) migration performance?
How does using a date filter in Migrator for Notes to Exchange (MNE) improve "phased" (staged) migration performance?
When migrating large amounts of data, some customers plan a "phased" migration approach. For example, the last 30 days (most recent) email could migrated first, then the rest of the email is migrated during a later "phase". In order to acheive the best performance in a "phased" migration it is best to use date filters for all migration phases in the MNE Migrate User Data wizard.
When using a date filter, MNE must still retreive the user's entire Notes mailbox. The date is then checked against the filter when the mail item reaches the MNE migration server. If a mail item does not match the date filter, then it is dropped with no further processing. If no date filter is used, then MNE must perform an additional processing to actively check the user's Exchange mailbox to see if the item has already been migrated.
To further improve the performance of a "phased" migration, you may also want to consider the creation of Notes mail file replicas that only contain data that is within the date filter window.