HP Hitachi Dynamic Link Manager Software - Manual (Page 170)

• A physical volume is created for only one of the logical device files on any
one path for each SCSI device to be managed by HDLM. In addition, a
volume group is created for only the physical volume.
This subsection describes how to check whether this condition exists.
• The logical volume is unmounted.
The following explains how to check whether the above condition exists when
the volume group vg02 consists of either one physical volume or two physical
volumes. Note that /dev/sde and /dev/sdu are assumed to be the logical
device files of SCSI devices defined for the same device to be managed by
HDLM.
To check the physical volumes that belong to the volume group vg02, execute
the following command:
# vgdisplay -v
The following figures show examples of command execution when the volume
group consists of only one physical volume (condition satisfied) and when the
volume group consists of two physical volumes (condition not satisfied).
Figure 3-4 Result of Executing vgdisplay -v (When There Is One Physical
Volume)
Check the shaded portion and confirm that vg02 consists of /dev/sde.
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Creating an HDLM Environment
Hitachi Dynamic Link Manager User Guide for Linux ®