i have a disk storage pool which i previously never coded a maximum size 
threshold for
i changed the disk storage pool to a max of 100mb, the server started backig 
up. it 
was running ok till it tried a 300mb file, i thought the 300mb file would then 
go to the
next storage pool directly which is a tape pool.

this mesage appeared in the dsmerror log file

ANS1312E Server media mount not possible


the device class for the disk storage pool is

   Device Class Name: DISK
Device Access Strategy: Random
    Storage Pool Count: 7
                Format: 
           Device Type: 
 Est/Max Capacity (MB): 
           Mount Limit: 
 Mount Retention (min): 
      Mount Wait (min): 
             Unit Name: 
                  Comp: 
          Library Name: 


the device class for the tape storage pool is

   Device Class Name: NT3590
Device Access Strategy: Sequential
    Storage Pool Count: 1
                Format: 3590B
           Device Type: 3590
 Est/Max Capacity (MB): 9,216.0
           Mount Limit: 3
 Mount Retention (min): 1
      Mount Wait (min): 60
             Unit Name: 3590-1
                  Comp: Yes
          Library Name: 


tim brown