MDisks

A managed disk (MDisk) is a logical unit of physical storage. MDisks are either arrays (RAID) from internal storage or volumes from external storage systems. MDisks are not visible to host systems.A managed disk (MDisk) is a logical unit (LU) of physical storage. MDisks are either arrays (RAID) from internal storage or LUs that are exported from external storage systems. MDisks are not visible to host systems.

An MDisk might consist of multiple physical disks that are presented as a single logical disk to the storage area network (SAN). An MDisk always provides usable blocks of physical storage to the system even if it does not have a one-to-one correspondence with a physical disk.

Each MDisk is divided into a number of extents, which are numbered, from 0, sequentially from the start to the end of the MDisk. The extent size is a property of pools. When an MDisk is added to a pool, the size of the extents that the MDisk is divided into depends on the attribute of the pool to which was added.