rsync - Jun 2020 - Rsync sometimes decides to delete all data

Hello,

I run into some really strange case I haven't seen so far over the 
years.
I syncing a lot of different macines, raspberry pis to a backup server 
nightly.
Lately one of them misbehaves.

Server rsync:  rsync  version 3.1.2  protocol version 31
Client rsync:  rsync  version 3.1.3  protocol version 31

Command used:
rsync --numeric-ids --delete --delete-excluded --delete-after -f "merge 
${BUFFER}" --stats  -e "${SSH_CMD}" root@${BACKUP_HOST}:/
$BACKUPROOT/

Sometimes when I run this script from the server it just decides to 
delete ALL files what it already have and sync is done.

I run it again couple of minutes after it syncs everything.

What can cause such a behavior? I can of course remove the delete 
directives but then the local copy will become messy over time and this 
perfectly works with all other machines.

It is not even that it cannot connect with rsync timeout and then it 
decides to delete the data. It can connect then decides to delete all 
data and done.

Rsync is run by root in any case so it's not a privilege problem.

Any ideas?

The only time I have seen something like that was when I was using rsync
to backup a snapshot and something went wrong in the snapshot creation
resulting in me rsyncing an empty dir instead of a mounted filesystem.
Does the --stats output imply that rsync saw an empty dir?

On 6/9/20 2:46 AM, freebsd--- via rsync wrote:
> Hello,
> 
> I run into some really strange case I haven't seen so far over the
years.
> I syncing a lot of different macines, raspberry pis to a backup server
> nightly.
> Lately one of them misbehaves.
> 
> Server rsync:? rsync? version 3.1.2? protocol version 31
> Client rsync:? rsync? version 3.1.3? protocol version 31
> 
> Command used:
> rsync --numeric-ids --delete --delete-excluded --delete-after -f
"merge
> ${BUFFER}" --stats? -e "${SSH_CMD}" root@${BACKUP_HOST}:/
$BACKUPROOT/
> 
> Sometimes when I run this script from the server it just decides to
> delete ALL files what it already have and sync is done.
> 
> I run it again couple of minutes after it syncs everything.
> 
> What can cause such a behavior? I can of course remove the delete
> directives but then the local copy will become messy over time and this
> perfectly works with all other machines.
> 
> It is not even that it cannot connect with rsync timeout and then it
> decides to delete the data. It can connect then decides to delete all
> data and done.
> 
> Rsync is run by root in any case so it's not a privilege problem.
> 
> Any ideas?
> 
-- 
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	Kevin Korb			Phone:    (407) 252-6853
	Systems Administrator		Internet:
	FutureQuest, Inc.		Kevin at FutureQuest.net  (work)
	Orlando, Florida		kmk at sanitarium.net (personal)
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	PGP public key available on web site.
~*-,._.,-*~'`^`'~*-,._.,-*~'`^`'~*-,._.,-*~'`^`'~*-,._.,-*~'`^`'~*-,._.,

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