Veritas Volume Manager 5.1 SP1 Administrator"s Guide (5900-1506, April 2011)

Figure 4-1
How DMP represents multiple physical paths to a disk as one node
Host
Disk
Multiple paths
Multiple paths
Single DMP node
Mapped by DMP
c2c1
VxVM
DMP
VxVM implements a disk device naming scheme that allows you to recognize to
which array a disk belongs.
Figure 4-2 shows an example where two paths, c1t99d0 and c2t99d0, exist to a
single disk in the enclosure, but VxVM uses the single DMP node, enc0_0, to access
it.
Figure 4-2
Example of multi-pathing for a disk enclosure in a SAN environment
enc0_0
Mapped
by DMP
VxVM
DMP
Host
Fibre Channel
switches
Disk enclosure
enc0
Disk is c1t99d0 or c2t99d0
depending on the path
c2t99d0c1t99d0
c1 c2
See “About enclosure-based naming” on page 24.
See “Changing the disk-naming scheme” on page 99.
See “Discovering and configuring newly added disk devices” on page 83.
Administering Dynamic Multi-Pathing
How DMP works
144