HP Plug-in for SAP NetWeaver Landscape Virtualization Management for Storage - Manual (Page 21)

7 Mapping multiple physical disks and multiple logical
volumes
To manage volumes used by the host systems, SAP NW LVM supports the following features:
•
Multiple physical disks contributing to one logical volume.
•
Multiple logical volumes created from one physical disk.
•
Multiple disks contribute to a volume group from which multiple logical volumes are created.
You can also use a physical disk directly, bypassing the host’s logical volume manager, for a
mount point.
These features are applicable to and independent of:
•
The arrays used:
HP 3PAR StoreServ ◦
◦ HP XP P9000
•
The host operating systems:
Linux ◦
◦ HP-UX
Ensure that appropriate logical volume manager is used in the host systems.
Volume management involves mapping of the following elements:
•
Physical disks or physical volumes
•
Volume group
•
Logical volumes
HP Storage Library located in the hosts maps all these elements.
During mount point retrieval from the host, all mount points of a system are mapped and returned
in the format (DiskWWN=PhysicalVolume-VolumeGroup-LogicalVolume,…). All paths from the
physical disk to the logical volume (DiskWWN=PhysicalVolume-VolumeGroup-LogicalVolume) are
unique. The system lists all the contributing paths for each mount point. Individual paths are
separated by commas.
HP Storage Library marks the duplicated disks using asterisks (*), so that the duplicated disks are
not cloned or relocated more than once.
CAUTION:
•
Do not share physical disks across instances.
•
Volume groups must be exclusive to an instance and should not be used for external purposes
to create logical volumes not used in any instance.
HP Storage Library lists the mounted Logical Volumes and performs mount and unmount operations.
21