Primordial storage refers to unallocated storage capacity on a storage device. Storage capacity can be allocated from primordial pools to create storage pools. This means that primordial pools are disk/device sources for allocation of storage pools. In Xsan primordial pools aren’t used but there is often unused capacity in the form of LUNs that are referred to as primordial at time. Especially on a Promise RAID where you might have certain LUNs that are smaller than the potential size of others and therefore might end up with disks left over which can be mapped and used as near-line storage later. This term, primordial, can be used to refer to those.