HP 3PAR User Manual download pdf (Page 50)

12 Exporting Virtual Volumes

Virtual volumes are the only data layer you can make visible to hosts. In order to make virtual

volumes visible to hosts, you must export (present) the virtual volume to the host.

The export process creates an association between the volume and a LUN. You configure the

characteristics of this association when you create the Virtual Volume-LUN pairing (VLUN).

To export virtual volumes, use the HP 3PAR Management Console. For more information, see the

HP 3PAR Management Console Online Help.

For more information about the maximum number of VLUNs that are supported for each host that

has your specific system configuration, see the Single Point of Connectivity Knowledge (SPOCK)

website:

http://www.hp.com/storage/spock

VLUN Templates and Active VLUNs

When you create VLUNs, the system produces both VLUN templates that establish export rules,

and active VLUNs that the host sees as a LUN or attached disk device expressed as a logical unit

number.

A VLUN template is an export rule that sets up an association between a virtual volume and a

LUN-host, LUN-port, or LUN-host-port combination that governs how the host can access the virtual

volume. A VLUN template can use one of the following export rules:

• A host-sees VLUN template allows only a specified host to see a volume.

• Host set allows any host that is a member of the specified host set to see a volume.

• A port-presents VLUN template allows any host on a specified port to see the volume.

• A matched-set VLUN template allows only a specified host on a specified port to see the

volume.

When you export volumes, and when the virtual volumes and host paths meet the parameters set

in the specified VLUN template, the system creates active VLUNs. The host system uses those active

VLUNs to access the virtual volumes in order to perform read/write operations.

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HP 3PAR User Manual Page 50