Rsync behaviour on harddisc crash

[Mac User FR]

Wouldn't it be better to use conditional expressions from sh with a  
smaller footprint than rsync --list to check if the directory exists?
I think on something like:
-d file
	      True if file exists and is a directory.
(source: man sh)
Cheers,
Vitorio
Le 18 mars 10 à 17:30, Linux Expert a écrit :

> Yes, it'll sync the source directory (now empty) to Server B,  
> deleting everything due to the --delete option.
>
> One solution I use is to place a check for the existence of a  
> subdirectory just before the rsync command in the script.  This was  
> you can make rsync contingent on the existence of that subdirectory,  
> possibly notifying you via email when it is not there.
>
> So if you had a subdirectory named "data" directly in the folder  
> you're syncing, your script (bash) would have something like the  
> following:
>
> rsync --list server::folder/data 1>/dev/null 2>/dev/null
> if [ $? eq 0 ]
>   then
>     rsync -a –delete server::folder  /folder
>   else
>     mutt -nx -s "rsync skipped due to missing directory!" <youremail>
> fi
>
> The idea is that you first tell rsync to list all files under the  
> folder/data directory.  If that directory doesn't exist, the command  
> will fail with a non-zero exit value.  This is precisely what you  
> check in the if conditional.  Now your rsync will either sync  
> properly with the assurance that the source folder is still there,  
> or notify you via email.
>
> These commands, exit values, etc should all be tested on your  
> server.  You may not even have mutt installed, or an MTA (ie:  
> Postfix) configured.  Testing is key.
>
> On Thu, Mar 18, 2010 at 8:46 AM, Christian Röder  
> <cr at strassenfeger.tv> wrote:
> I was just pondering:
>
>
> Lets look at Server A with one extra harddisc hdb, where hdb1 is  
> mounted at /mnt/folder.
>
> /mnt/folder is the folder which should be mirrored on Server B.
>
> So Server B rsyncs
>
>
> rsynch -a –delete server::folder  /folder
>
>
> from Server A and gets all the new files and deletes all the files,  
> which doesn't exist on Server A's /mnt/folder anymore.
>
>
> What would happen, if the harddisc hdb would fail?
>
> Will this happen?:
>
>
> harddisc hdb failes
>
> hdb1 is not automatically mounted at /mnt/folder
>
> Server B rsyncs from Server A, but /mnt/folder is empty, so rsync  
> deletes every file in the mirror folder on Server B?
>
>
> Are my assumptions correct?
>
>
> Thanks in advance,
>
>
> Christian
>
>
>
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