The backup on Server is already in use
Solution 1:
Just for the completeness of this issue. If you land here and do not use MacOS Server, but a Synology DiskStation, do the following:
- Login to your DiskStation as root
- Open the main menu
- start the
resource monitor - switch to
connected users - select the blocked user and press
disconnect
Solution 2:
I have got this problem since I got my OS X Server, and still do get this error. Whenever my router disconnects, it causes this until I fix it. However, instead of restarting the server, there's a workaround:
- Open Server.app (I do this on the client that I'm using, but you could do it on the server itself) and login.
- Select the File Sharing service.
- Go to the Connected Users tab.
- Select each connected user and click Disconnect.
I have to do this so often I wrote a Keyboard Maestro macro for this, but any scripting software would do this.
Solution 3:
If disconnecting users "fixes" the problem then it's almost certainly somewhere in the AppleFileServer process.
Have a look at the AFP access and error logs and see if you can find a better error message than the one you get on the client Mac and you may well be closer to a solution. Click on Logs in the left hand pane of the Server app and then select AFP Error in the pop up below the log window.
The problem might also be with the RAID in the Drobo. Have you tried another hard drive just to see if the problem goes away? Which model Drobo is it? Drobo support mutters under its breath about Lion and Time Machine so may well also have problems with Mavericks and Time Machine. (I get around the problem by having a single 2TB drive with 3 partitions as my TM target and then back that up to my Drobo using Carbon Copy Cloner.)