|Key selection criteria|
Some key areas to consider while comparing asynchronous replication software.
by setting policies in the network, the storage system or both. Most storage systems leave most of the management to the network, but some storage systems let you prioritize replication traffic and fine-tune quality of service queues.
Recovery point objective (RPO) is the point in time to which data must be restored to satisfy application owners. For applications that require more specific point in times of recovery down to seconds, minutes or specific writes, you should select a high-end storage system that supports write-order fidelity. Users who can recover to an approximate point in time (give or take 15 minutes), will find snapshots taken at specific intervals adequate for their needs.
Recovery time objective (RTO) defines how soon businesses must recover before unacceptable risks to the business may occur. For applications that must be up in seconds or minutes, you should consider only high-end storage systems that support both synchronous and asynchronous replication software. For applications that have 60 minutes or more to recover, asynchronous replication on midrange storage systems should suffice.
This was first published in September 2007