root aggregate questions

Hi,

I am looking at the aggregates and notice our FAS2650 with two controllers (nodes) having both aggregates named below with just 17.85 GB left (total 368 GB).   Is that the location of where the OS resides?  Will that be enough for an upgrade from 9.2p1 to 9.3p18?

root_cmnas01 & root_cmnas02

Also under SVMs --> Volumes, there is a volume called cm_svm_root.  Is this a subset of the aggregate above? I am guessing its the root level (\\nas\c$) accessible from a Windows machine.  Can someone confirm.

Thanks,

Svho1