Isilon snmp monitoring devfs 100%

We just added a bunch of isilon to our snmp based monitoring and the trend i see is that Volume /dev type devfs are all showing 100% space used. Can i safely unmonitor these volumes? 

Also if there are other volumes i should unmonitor that would be helpful. If it helps here are other volumes i see from my snmp monitoring

/Base

/

/hwmon

/ifs

/keystore

/tmp

/var

Real Memory Metrics

Shared Real Memory Metrics

Thank you in advance. 

Chuck