Veritas Volume Manager 5.0.1 Administrator's Guide, HP-UX 11i v3, First Edition, November 2009

Figure 3-1
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 3-2 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 3-2
Example of multipathing for a disk enclosure in a SAN environment
enc0_0
Mapped
by DMP
VxVM
DMP
Host
Fibre Channel
hubs or
switches
Disk enclosure
enc0
Disk is c1t99d0 or c2t99d0
depending on the path
c2t99d0c1t99d0
c1 c2
See “Enclosure-based naming” on page 26.
See “Changing the disk-naming scheme” on page 98.
See “Discovering and configuring newly added disk devices” on page 81.
Administering Dynamic Multipathing
How DMP works
140