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Time Machine prohibits networked drive access in Mountain Lion

2617 Views 7 Replies Latest reply: Aug 19, 2012 2:42 PM by HenryS RSS
HenryS Level 2 Level 2 (295 points)
Currently Being Moderated
Jul 30, 2012 11:26 AM

I have Time Machine (TM) set to use an external networked drive for it's backup, (at some point after a successful backup, I think) the drive will become unavailable. After that, trying to mount the drive again results in the warning that the drive (in fact the entire computer it's physically attached to on the network) is no longer available due to too many users logged in! There are at the most three connected!


I've heard other known troubles exist in this regard with smb connectivity and ML. Is this true? My connectivity is AFP, I think.


The drive is left mounted on the computer being backed up by TM and goes off line as described above by itself. There are other physically attached drives physically attached to the same other computer (MacMini) computer mounted on this computer's desktop. I've never had the same problem on Lion or Snow Leopard and I've been doing backups in the same way for years. Has anybody had this problem??


Should I upgrade the Mini from it's current 10.6.8 OS to Mountain Lion also? Will this make life better or worse in this regard?


I connect the problem to ML because:

  • Just went on ML very recently.
  • Happens consistently now and hasn't done before.
  • Other computer that hosts these drives in running 10.6.8 and this may an incompatibility between OS's.
  • Heard of similar issues with smb network connectivity.
  • On backup using CCC this problem does not occur.
  • The work-around is completely turning off both computers and restarting them, logging in the backup drive all over again. The problem eventually recurs.
  • Logging out and in again on the client computer (MacPro) does NOT fix the problem, however.


Advice appreciated.

Mac Pro, Mac OS X (10.7.3), (1,1) 9GB RAM, 500GB+250GB HD int.
  • Pondini Level 8 Level 8 (38,710 points)

    HenryS wrote:

    . . .

    My connectivity is AFP, I think.

    Yes, that's the only way TM works over a network.



    Should I upgrade the Mini from it's current 10.6.8 OS to Mountain Lion also? Will this make life better or worse in this regard?

    You'll likely have the same problem.


    It sounds like some odd networking issue, where the NAS doesn't realize a backup has finished and thinks the user is still logged-on.  So after one (or several) backups, it chokes.


    Check with the maker of your NAS, to see if there's an update, or if they know of the problem.  I've not seen this particular issue reported, but I haven't seen all the posts.  I don't do networking, but have seen a number of posts about updates to NetATalk which mignt be involved here.

  • Pondini Level 8 Level 8 (38,710 points)

    HenryS wrote:

    . . .

    Maybe I misled you. I have a FW drive attached to my Mac Mini, simply access the drive over the network.

    Ah, sorry, I took "networked disk" to mean a NAS (a lot of threads about them here).


    Failed to get NSURLVolumeURLForRemountingKey for /Volumes/MobileBackups, error: Error Domain=NSCocoaErrorDomain Code=4 "The file “MobileBackups” doesn’t exist." UserInfo=0x7fbe71404b30 {NSURL=file://localhost/Volumes/MobileBackups/, NSFilePath=/Volumes/MobileBackups}

    Is the name of the backup drive/partition MobileBackups?  If it is, change it (that might be the problem -- that's the name of the folder where your Local Snapshots are kept, so may confuse OSX in trying to connect.)

  • rservello Calculating status...

    I'm having this exact same problem, I have never used remote management..I have always set it up as screen sharing and file sharing.  I am now restricting file sharing access to only my user name, and that doesn't help.  It is only time machine that is doing this and its making me crazy!  I will wake up in the morning and it won't have completed a backup because it claims there are too many users logged in!  I have 2 computers that can log in to it!!! 2!!!  The limit is 10....this makes NO SENSE.


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