We want to upgrade HNAS from 8.1 to 10.2.
I understand that we have to first upgrade to 8.2 and then it would be upgraded to 10.2 with a reboot (downtime).
We have a 2-node cluster.
I want to know how much time would it takes to upgrade from 8.1 to 8.2 (online)
and from 8.2 to 10.2. (downtime required)
Do we have to unmount Shares from Linux and Windows machines before upgradation?