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22 Understanding Veritas Volume Manager
How VxVM handles storage management
Figure 1-2 How VxVM presents the disks in a disk array as volumes to the
operating system
Multipathed disk arrays
Some disk arrays provide multiple ports to access their disk devices. These
ports, coupled with the host bus adaptor (HBA) controller and any data bus or
I/O processor local to the array, make up multiple hardware paths to access the
disk devices. Such disk arrays are called multipathed disk arrays. This type of
disk array can be connected to host systems in many different configurations,
(such as multiple ports connected to different controllers on a single host,
chaining of the ports through a single controller on a host, or ports connected to
different hosts simultaneously).
HP-UX 11i v3 provides its own native multipathing solution in addition to the
Dynamic Multipathing (DMP) feature that is used by VxVM. These two
multipathing solutions can coexist on the same system. For more information,
see “DMP coexistence with HP-UX native multipathing” on page 130.
Device discovery
Device discovery is the term used to describe the process of discovering the
disks that are attached to a host. This feature is important for DMP because it
needs to support a growing number of disk arrays from a number of vendors. In
conjunction with the ability to discover the devices attached to a host, the
Disk 4Disk 3Disk 2
Volumes
Operating system
Physical disks
Veritas Volume Manager
Disk 1