SNMP for Isilon

Try to setup SNMP for Isilon but don't see much document.  Hardware issue is monitored by vendor through eSRS and also alert us through SMTP.  

We try to use SNMP to monitor the share usage for NFS.  We run a few test to confirm the message Tivoli see when it exceeds the advisory and soft limit.  Also, the message it will see when it continue violating the limit.  

Main issue we discover is Tivoli does not receive the alert all the time.  Later on, we find out it can send out SNMP from any of the node in the cluster.  With our Isilon setup, we have at least 5 zones on different subnet.  Because of firewall rules, not all of the subnet can be reached by SNMP manager.  Because we have 3 types of nodes, Flash nodes (serving FE traffic), Hybrid nodes (serving some less critical application and replication) and Archive nodes (backup traffic only), we decide to use Archive nodes for monitoring.  We confirm SNMP can reach backup subnet.  Then, modify Isilon Alert section.  Create a SNMP Monitoring channels.  

Modify only Archive nodes can send out SNMP alerts (see below).  In my setup, it is nodes 1 - 4.  Now, SNMP alert will only be sent through archive nodes which has no issue reaching the SNMP manager.