Brian May <[email protected]>
writes:

> I was running a unison sync to a remote ssh server, iotop was saying no (or
> low) disk I/O, top says up to 60% iowait, and basic tasks (e.g. clicking on
> xterm or selecting text in xterm) take ages (system appears to be frozen).
> Oh, and no swap being used, have 16GB ram with relatively few processes
> running. This seems to be typical.
>
> iotop and iosnoop don't seem to report anything abnormal that I can see
> using the disk. There are cron jobs that run at times, however these
> problems occur with no cron jobs running (and basic cron jobs shouldn't
> kill a modern system in any case).
>
> Not absolutely convinced this is a disk I/O problem, however something
> weird is happening here.

ionice -c3 unison on both hosts?
Does the problem occur with rsync?

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