Replicating uploaded images stored in filesystem

Hi I am currently writing an application that allows users to upload images, which are stored on the filesystem with a reference in the database. However I have multiple application servers which these files need to be replicated to.

What are common methods for doing something like this? 开发者_StackOverflow社区Are there any particularly good tools/scheme I can implement to do this?

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To replicate files, I would use rsync.

Replication of references in the database, assuming that you have multiple writers, may be more complicated and depends on the DBMS and reference assignation scheme.

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Consider using an existing file storage platform such as Amazon.com's S3. It would allow you to server user's images directly from their service.