RAID and Subsystem Architectures
Assigning Hosts to Storage
Drive Assignment: Subsystem Level
Logical Disks SCSI LUNs Physical Disks
Host A 2 x 1 GB
5 x 1GB
Drive D (3 GB)
SCSI ID 2
1 x 3 GB
Drive D (1 GB)
SCSI ID 0
Drive E (1 GB) SCSI ID 1
Volume Manager HBA Utility RAID Configuration Utility
LUN Mapping LUN Masking
When we use a Disk Subsystem, the HBA can be restricted to only
discovering resources that it is allowed to use.
The RAID or Subsystem Configuration Utility supports LUN Masking. This
allows us to configure which hosts are permitted to see which Logical Units.
The mask is created by assigning the HBAs unique worldwide name, typically
the World Wide Port Name, to each Logical Unit. This means that when the
host scans for its resources, the Subsystem will only advertise back the LUNs
that that particular host is allowed to use.