At present I deploy ESXi servers with 15k SAS drives in RAID1 mirror and install the ESXi OS (Hypervisor) onto that. All VMs then sit on SANs sized accordingly.
It has always bugged me that I cannot find any literature about how to size the drives that the Hypervisor runs on.
My question really is: Do the drives you use depend upon implementation and usage of the host or should I look at lower spec disks (SATA/near-line SAS)? If it is based on the usage, what are the thresholds for the different types of disk if known?