LUN Mapping
• LUN mapping maps LUNs defined by the
storage array into logical units in the HBA:
– LUNs are often associated with volumes
– Structured file systems like VxFS, use
1GB
VxVM to create logical volumes from
JBOD
1GB
Drive D
1GB
multiple LUNs
Drive E 1GB
• The SAN administrator assigns a local OS
1GB
volume ID to each LUN:
SAN 2GB
Drive D
RAID
1GB
Drive E
– /dev/dsk/c1t2d0s2 (UNIX)
–D: (Windows)
1GB
2GB
• Mapping survives reboot/reconfiguration
RAID
1GB
– HPUX and Solaris require Persistent
Binding
• Ensures accessibility of storage resources
• All HBAs today support LUN mapping
LUN mapping allows administrators to control LUN visibility to hosts:
On the subsystem, each logical unit is assigned a unique identifier.
The administrator uses storage management tools to assign local OS
volume IDs (such as /dev/dsk/c1t2d0s2 or D:\) to specific logical units
based on their subsystem IDs.