RAID and Subsystem Architectures
Shelf No4 : 16x SATA disks
FC or iSCSI can be
used to connect the
storage array to the
SAN while the internal
connections may be
Shelf No1 : 16x FC disks FC, SAS or SATA.
FC or iSCSI
Shelf No2 : 16x FC disks
(some have transparent to the SAN.
Shelf No3 : 16x FC disks
A collection of disks with a controller that provides mirroring or striping
A Disk Subsystem typically isolates the internal architecture from the outside
For open systems connectivity the host ports will support either Fibre Channel
or iSCSI, but the subsystem can also support mainframe connectivity via
ESCON or FICON.
The host will see its storage presented as a Logical Unit and the physical data
layout will be hidden inside the subsystem.