here is the detailed step-by-step doc , this is for 7.0.1.4 to 7.0.1.6 but procedure is same for any version unless you doing from very old to new also in some cases patches need to be installed , check the release notes as well.
Hello Guys,  I am new to Isilon Storage and got an assignment to upgrade our Isilon Cluster (11 Nodes) to OneFS v6.5.5.22 from OneFS v6.5.5.16. Can anybody help me in this regard?
How to Upgrade OneFS v6.5.5.22 from OneFS v6.5.5.16