Proxmox cluster

Hi,

New proxmox user here.
Planning on migrating our current vmware vsan servers to proxmox. (14 VM's)

Currently in process of ordering 3x HP DL380gen11 servers. (not ordered yet)
2x intel 6530 gold cpu/512GB ram/node, rest of the hardware seems ok except the thing that worries me is the 4X 6TB SAS disks @7200rpm.
Will this be a bottleneck when using a HA cluster -3 nodes- with ceph?

Thanks,