I am having some issues w/ clients.  Every client is failing w/ a
"return code 12".
I can't find anything on this.  The closest thing I've found is 

0012 E
DSM_RC_ABORT_MOUNT_NOT_POSSIBLE
Explanation: Server media mount not possible. The
        server timed out waiting for a mount of an offline
        volume.
System Action: File skipped.
User Response: Retry later when server volumes can
        be mounted. Ensure that the MAXNUMMP (maximum
        number of mount points) defined on the server for this
        node is greater than 0.

Which can't be right as all the volumes on the server are online.  It's
going to a file storage pool, so mount points should be irrelevant (or
maybe I'm just not understanding mount points).

So - what exactly is a 'return code 12'?  Especially since I got one of
the machines to backup just fine, and later in the day it failed again.
Doing the exact same command from the client command line

"dsmc incremental -SUBDIR=yes C:\Docu*\*"

Works great.  But the scheduled backup fails every time so far.
server schedule -

    Schedule Name: TEST
      Description: Testing options
           Action: Incremental
          Options: -SUBDIR=yes
          Objects: C:\Docu*\*
         Priority: 5
   Next Execution: 37 Minutes
         Duration: 50 Minutes
           Period: 1 Hour
      Day of Week: Any
           Expire: Never

sim