I tried all of the suggestions and still had the problem.  I contacted Symantec 
and we got it fixed.  Here is a summary:

ISSUE REPORTED: Not all 10 drives are in use at any given time backups will use 
only 8 drives randomly. But it will always be any 2 drives out of the 10 that 
won't be used.

INITIAL INVESTIGATION: 
-Max jobs per client is set to 99 under Host Properties >> Master Server >> 
Global Attributes
-Max concurrent drives is set to 10 under Storage Units >> Problem Storage Unit.

TROUBLESHOOTING:
-Ran robtest (s d) to check if the two drives already had a tape stuck in them. 
No.
-Guessing that it is an nbrb allocation issue.
-We ran <Install Drive>:\Veritas\netbackup\bin\admincmd\nbrbutil -dump to check 
the point in time MDS Allocations within EMM.
-Saw two orphaned allocations without any attributes matching current 
allocations.

MdsAllocation allocationKey=7191130 jobType=16 mediaKey=4002098 mediaId=002033 
driveKey=0 driveName= drivePath= stuName= masterServerName=mfbback01 
mediaServerName=mfbback01 ndmpTapeServerName= diskVolumeKey=0 mountKey=0 
linkKey=0 fatPipeKey=0 scsiResType=0 serverStateFlags=0

MdsAllocation allocationKey=7191132 jobType=16 mediaKey=4000992 mediaId=002016 
driveKey=0 driveName= drivePath= stuName= masterServerName=mfbback01 
mediaServerName=mfbback01 ndmpTapeServerName= diskVolumeKey=0 mountKey=0 
linkKey=0 fatPipeKey=0 scsiResType=0 serverStateFlags=0

-Looks like nbrb is holding up further resource allocation due to these 
orphaned alloc holds.

-Released the holds by running nbrbutil -releasemds <allocation key as 
underline above>
-Verified last written date on one of the media by running nbemmcmd -listmedia 
-mediaid 002033. It was dating back to 30th January 2009.
-This is roughly the time frame when the issue started.
-After releasing the holds we are now able to fire up jobs on them drives.


Thanks to everyone for your suggestions.  I think I am seeing improvement from 
setting the max jobs higher.

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