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This is basically a negative answer. It appears that neither dd, nor mbuffer, nor even pv works is all cases, in particular if the rate of data generated by the producer can vary a lot. I give some testcases below. After typing the command, wait for about 10 seconds, then type > (to go to the end of the data, i.e. wait for the end of the input). zsh -c ...


I suspect the --fake-super options. That tells rsync to store all the metadata information in extended attributes on each file. I suspect accessing those attributes are slow. Try a test run with rsync to a root without --fake-super. You can't reuse the same backup since the attributes won't match.


I know you should use No-op for Solid Sate Drives or SSD s for sure. Not necessarily. I don't know why people keep treating SSD's as some kind of special case where you don't need the benefits of other schedulers. Having rotating disks just means it's more important to have requests merged. Merging requests is just one thing that the scheduler does. ...

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