Problem solve Get help with specific problems with your technologies, process and projects.

Synchronous vs. asynchronous

Where can I find a detailed comparison matrix for synchronous vs. asynchronous replication and the benefits and disadvantages of each technology?

Veritas has a white paper on this, but it doesn't have a chart comparing them.

Asynchronous replication does not depend on acknowledging the remote write, but it does (in Veritas' implementation) write to a local log file. Synchronous replication depends on receiving an ACK from the remote system and the remote system also keeps a log file.

Async is fastest. It is impossible to accurately recreate data at the remote end because there is no way of knowing what was successfully transmitted. However, if there is a disaster at the local site, data will need to be rebuilt from the log file. If the local log file is gone, then traditional backup/recovery is needed.

If synchronous replication is used the remote site data could be used to rebuild data at the local site. In that sense, synchronous replication is more secure by providing additional redundancy.



Editor's note: Do you agree with this expert's response? If you have more to share, post it in our Storage Networking discussion forum.

Dig Deeper on Remote data protection

Have a question for an expert?

Please add a title for your question

Get answers from a TechTarget expert on whatever's puzzling you.

You will be able to add details on the next page.

Join the conversation

1 comment

Send me notifications when other members comment.

Please create a username to comment.

Synchronous and Asynchronous are concepts that can be applied to many different types of operations.  Since this article refers to replication specifically, it would be a good idea to change the title to reflect that.