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Locane
Asked: 2018-03-02 11:25:27 +0800 CST

DU shows fluctuating up then down totals during active rsync

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I have 2 CentOS systems, one is rsyncing a ~411 gig directory to another.

On the receiving system, I typically run du -cs * |grep total;sleep 5 as a way to monitor the background rsync operation and make sure it is actually happening, since I don't know of a good way to monitor it as it runs otherwise.

The behavior I'm seeing is that du will show the total number of kilobytes go up, then go back down to a previous (and exact) value:

430235952       total
430235952       total
430235952       total
430235952       total
430235952       total
430235952       total
430235952       total
430235952       total
430498032       total <----
432333040       total <----
434430192       total <----
430235952       total <---- Back down to original value>
430235952       total
430235952       total
430235952       total
430235952       total
430235952       total
431284468       total <---- Up again
434430196       total <----
430235952       total <---- Back down again>
430235952       total
430235952       total
430235952       total
431284468       total <---- ???
434430196       total <---- ???
430235952       total 
430235952       total
430235952       total

Does anyone know what's going on here?

linux

1 Answers

  1. I could be wrong but it looks like maybe a file is being transferred and it is later found to have corrupt data so rsync deletes the corrupt copy and tries again, you could run rsync with the -v flag so it outputs verbose information but you really shouldn't sweat it too much. If there is a problem with the transfer it will likely output warning information letting you know what's going on and not just hang indefinitely.

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