Max files per directory on Amazon S3

I'm currently storing ~3 million images files in a single directory on my server, which is causing serious performance issues. I'd like 开发者_运维知识库to move them to Amazon S3 and I'm wondering whether I'd need to use a hierarchical folder structure or whether I can store them in a single folder on S3.

I get a large percentage of my traffic from google image search and I don't want to hurt my SEO by changing the image path, so a single folder on S3 would be ideal if there aren't any performance issues. I imagine LIST operations would be slow, but I'm okay with that.

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S3 has no limit on the number of items stored in a bucket. In fact, using a 'directory' separator in key names is completely optional.

There is a practical use for using a separator in your key: as you correctly guessed listing the keys will be more difficult as you'll have to page though many list results.

However, as the S3 documentation points out you can use any character as a separator.