The KVM hosts that run HCP VM nodes use shared storage. This shared storage should be backed by a storage area network (SAN) with RAID 6 protection, or by storage that is internal to the KVM hosts. With SAN storage, each KVM host is connected to the storage array through two Fibre Channel switches, which helps make sure data is available if a single host fails.
SAN storage is presented to each KVM host as logical units (represented by LUNs). On each KVM host, the logical units are formatted into an ext4 file system. Using Virtual Machine Manager, you create a storage pool from the file system on each host. You allocate virtual machine disks, which HCP VM reads as internal drives, out of the storage pools. The HCP operating system and software are installed on the virtual machine disks.
With storage that is internal to the KVM hosts, each LUN allocated from the internal storage corresponds to a storage pool. Like SAN storage, the physical storage underlying the internal storage must be RAID protected.