I'm trying to run jobs on the cluster of our university, and I come across this result when I trying to see the status of the cluster:

llstatus

Name          Schedd InQ  Act Startd Run LdAvg Idle Arch      OpSys    
pandora001    Down      0   0 Run     29 41.04 9999 POWER7    AIX61    
pandora002    Down      0   0 Busy    32 32.06 9999 POWER7    AIX61    
pandora003    Down      0   0 Drned    0 0.03  9999 POWER7    AIX61    
pandora004    Down      0   0 Busy    32 32.07 9999 POWER7    AIX61    
pandora005    Down      0   0 Busy    32 32.02 9999 POWER7    AIX61    
pandora006    Down      0   0 Busy    32 34.01 9999 POWER7    AIX61    
pandora007    Down      0   0 Busy    32 32.02 9999 POWER7    AIX61    
pandora008    Down      0   0 Drned    0 0.00  9999 POWER7    AIX61    
pandora1      Avail    15   5 Idle     0 0.00    86 POWER7    AIX61



llstatus -R

  Machine                        Consumable Resource(Available, Total)            
------------------------------ -------------------------------------------------
pandora001         ConsumableCpus< 28-31 >< 0-31 > ConsumableMemory(28.297 gb,124.000 gb)+
pandora002         ConsumableCpus< >< 0-31 > ConsumableMemory(14.625 gb,124.000 gb)+
pandora003         ConsumableCpus< 0-31 >< 0-31 > ConsumableMemory(124.000 gb,124.000 gb)+
pandora004         ConsumableCpus< >< 0-31 > ConsumableMemory(28.000 gb,124.000 gb)+
pandora005         ConsumableCpus< >< 0-31 > ConsumableMemory(28.000 gb,124.000 gb)+
pandora006         ConsumableCpus< >< 0-31 > ConsumableMemory(14.625 gb,124.000 gb)+
pandora007         ConsumableCpus< >< 0-31 > ConsumableMemory(5.250 gb,124.000 gb)+
pandora008         ConsumableCpus< 0-31 >< 0-31 > ConsumableMemory(124.000 gb,124.000 gb)+
pandora1           ConsumableCpus< 0-7 >< 0-7 > ConsumableMemory(32.000 gb,32.000 gb)

It seems that the pandora003 and pandora008 are in the status of "Drned". What does that mean? Why I can't use the resources of at thoes nodes? Thanks.