Why does rsync spawn multiple processes for me?

Posted by Yoga on Server Fault See other posts from Server Fault or by Yoga
Published on 2013-10-19T04:44:17Z Indexed on 2013/10/19 9:57 UTC
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I am using the following cron statement to backup from one folder to another folder in the same machine:

19 21 * * * root  rsync -ac --delete /source/folder /dest/folder

When I use pstree, I see the cron forked three processes

 +-cron---cron---rsync---rsync---rsync

And ps

 9972 ?        Ds     1:00 rsync -ac --delete /source/folder /dest/folder
 9973 ?        S      0:29 rsync -ac --delete /source/folder /dest/folder
 9974 ?        S      0:09 rsync -ac --delete /source/folder /dest/folder

Why are three processes? Can I limit to only one?

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