Hi, Yes, you can remove them from monitoring. They are for memory management. Let us know if you have any additional questions.
I added some isilons to my monitpring tool and see volumes having MALLOC and UMA in their names but these do not appear to be traaditional volumes as i do not see total/free etc. I would like to know if i can safely remove these from my monitoring. Each of these takes a license in our monitoring tool and between both MALLOC AND UMA the count is over 1,000. Much appreciated in advance.      
Monitoring isilon via snmp