IBM TotalStorage DS6000 Attachment Manual page 87

The steps to configure MC/ServiceGuard with the storage unit are the same as the
steps in the Hewlett-Packard high availability documentation. You can find that
documentation at www.docs.hp.com/hpux/ha/index.html.
After you configure your host for normal operating system access, the storage unit
acts as a normal disk device in the MC/ServiceGuard configuration. Create volume
groups that contain the volumes by using the Hewlett-Packard logical volume
manager. This method of disk management is more reliable, easier, and more
flexible than whole-disk management techniques.
When you create volume groups, you can implement PV-Links, Hewlett-Packard's
built-in multipathing software for highly available disks such as the storage unit.
1. Create the volume group, using the path to the volumes that you want as the
primary path to the data.
2. Extend the volume group with the path to the volumes that are intended as
alternate paths.
The logical volume manager reads the label on the disk and knows that it is an
alternate path to one of the volumes in the group. The logical volume manager
labels the volume.
As an example, assume that you have a host that has access to a volume on a
storage unit with the device nodes c2t0d0 and c3t0d0. You can use the c2 path
as the primary path and create the volume group that uses only the c2t0d0
path.
3. Extend the volume group to include the c3t0d0 path. When you issue a
vgdisplay -v command on the volume group, the command lists c3t0d0 as an
alternate link to the data.
Chapter 6. Attaching to a Hewlett-Packard Servers (HP-UX) host
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