How to speed up rsync/tar of large Maildir

Posted by psusi on Ask Ubuntu See other posts from Ask Ubuntu or by psusi
Published on 2011-03-10T20:55:15Z Indexed on 2011/03/11 0:18 UTC
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filesystem

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Performance

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disk-management

I have a very large Maildir I am copying to a new machine ( over 100 BaseT ) with rsync. The progress is slow. VERY SLOW. Like 1 MB/s slow. I think this is because it is a lot of small files that are being read in an order that essentially is random with respect to where the blocks are stored on disk, causing a massive seek storm. I get similar results when trying to tar the directory. Is there a way to get rsync/tar to read in disk block order, or otherwise overcome this problem?

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