Seagate ST39103LC User's Guide download pdf (Page 51)

Chapter 4. SVA Path Installation 41

This section shows how to create a new volume group and add a

disk drive to it, using example screens from an HP 800 system

running HP-UX 11.00.

Definitions of

Common Terms

The following terms will be used throughout this section:

• Volume Group. Volume groups are HP-UX's method for

dividing and allocating disk storage space. Volume groups

can be used to partition a disk drive into smaller logical

volumes (see below). There is a default limit of 10 volume

groups per system; see the HP-UX System Administration

Tasks manual for information on increasing this limit. The

number of logical volumes in a volume group is limited to

255.

• Logical Volume. Each volume group is divided into logical

volumes, which can be accessed as either character or block

devices and which contain their own filesystems.

• Physical Volume. In volume groups, the physical disk

drives are designated as physical volumes.

• Physical Extent. Each physical volume is divided into units

called physical extents; these units are 4 MB by default, and

can range in size from 1 MB to 256 MB. The size of physical

extents is a property of the volume group and is the same for

all physical volumes in the volume group.

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Seagate ST39103LC User's Guide Page 51