Hi!
We are running PVE 4.2 with two nodes in a cluster:
ProLiant DL320 G5p with HDDs, RAM 8 GB and ZFS
Dell PowerEdge R530 with SSDs, RAM 16 GB and ZFS
Old ProLiant works like a charm. It hosts some 7 light LXC containers and RAM usage is 50% from total. There are no issues with this old...