In message , Richard Kettlewell
 writes
>Adrian  writes:
>> In total there are 8 Pis on the network, with OS versions varying from
>> Wheezy to Buster.  All of them do a "push" rsync to the target
>> machine, seven across the network, and the target from its SD to the
>> HDD.  All work fine apart from this one machine.  The source machine
>> does a "pull" rsync from the targets HDD to the source's SSD.  This
>> also works OK.
>>
>> So the only thing in this that I can see is unique is the source
>> machine.
>
>Cable and switch port are presumably unique too, and easy to rule out.
>

On the basis of trying the easy fixes first, I've swapped the lead and
switch port.

However that was this morning, after the overnight rsync job ran, which
worked this time around.

If that doesn't work, then next it will probably be swapping the Pi (but
keeping the SD card).  I've got a spare Pi 2, which ought to be up to
the job.

Adrian
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