In message , Chris Green 
writes
>Adrian  wrote:
>> I have a Pi3B which has a SSD mounted on it.  When I try to rsync parts
>> of the SD card to another PI (with a disc mounted on it), it will work
>> for a short period of time (4 days - one rsync/day), then fails.  When
>> it fails, it syncs some files, then hangs.  The session eventually stops
>> when the SSH link times out.  If umount then mount the SSD, things are
>> back to normal.  Access to the SSD seems to be OK.
>>
>> What I'm running is :
>>
>> rsync -av --delete
>>
>>--exclude={/run,/tmp,/proc,/dev,/sys,/var/swap,/var/backups,/var/cache,
>>/media}
>> / : 2>&1 > /tmp/rsync.log
>>
>> Unmounting and remounting the SSD before the rsync operation seems to be
>> a bodge to get around this problem, but I haven't been able to find any
>> suggestions online as to what the problem might be.
>>
>> A bit of background.  This PI is a replacement for one which failed, new
>> Pi, new SD card, and a new disk (the old one wouldn't mount on the PI,
>> but would on my Ubuntu PC).  The script is the same one that I was using
>> with the old config, and that worked happily for several years.
>>
>What's connecting the two Pis?  I.e. is it wholly wired ethernet or
>are there some WiFi links in there?
>
>

Ethernet all the way.  Source Pi is connected to a switch, that switch
is connected to another switch, and the target Pi is connected to the
second switch.

Adrian
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