Physical disks

IBM Storage Scale RAID uses pdisks to store user data and IBM Storage Scale RAID internal configuration data.

A pdisk is a conventional, rotating magnetic-media hard disk drive (HDD) or a solid-state disk (SSD). All pdisks in a declustered array must have the same capacity.

It is assumed that pdisks are dual-ported. In this type of configuration, one or more paths are connected to the primary IBM Storage Scale RAID server and one or more paths are connected to the backup server. Typically, there are two redundant paths between an IBM Storage Scale RAID server and connected JBOD pdisks.