RFC: slow-down option

[Marian Marinov]

Hello,

I've been using rsync on some backup servers for years. In 2011 we had a situation where the FS of the backup server was 
behaving strange, even thou there was enough available I/O, the fs(ext4 on 16TB partition with a lot of inodes) was 
lagging. After much testing we found that rsync was hammering the fs too hard.

At that point I patched rsync to add a stupid option which will sleep for a while before creating new file.
That helped us a lot to keep the same rate of concurrent rsyncs to the same machine.

I would love your comments on this, generally stupid approach to the problem :)

Best regards,
Marian


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