Vlun Templates And Active Vluns; Vlun Template Types; Host Sees; Host Set - HP 3PAR StoreServ 7200 2-node Manual

Exporting virtual volumes can be performed with both the HP 3PAR Command Line Interface (CLI)
and the HP 3PAR Management Console. Refer to the HP 3PAR Command Line Interface
Administrator's Manual and the HP 3PAR Management Console Online Help for instructions on
how to perform this task.

VLUN Templates and Active VLUNs

A VLUN template sets up an association between a virtual volume and a LUN-host, LUN-port, or
LUN-host-port combination by establishing the export rule. When you create a VLUN template, if
the current system state meets the conditions established by the VLUN template, that template is
immediately applied to create one or more active VLUNs. These active VLUNs enable virtual
volumes to be exported to hosts. If the current system state does not meet the conditions of the
VLUN template, no active VLUNs are created until the conditions of the template are met.
Once a VLUN template is applied to create one or more active VLUNs, hosts continue to be able
to access volumes based on the export rule established by that template. Removing VLUNs associated
with a volume halts host access to that volume. Removing all VLUNs for a host stops the host from
accessing all volumes.

VLUN Template Types

A VLUN template sets up an association between a virtual volume and a LUN-host, LUN-port, or
LUN-host-port combination by establishing the export rule, or the manner in which the volume is
exported. A VLUN template enables the export of a virtual volume as a VLUN to a host or hosts.
Those volume exports, which are seen as LUNs by the host or hosts, are active VLUNs.
A VLUN template can be one of the following types:
Host sees allows only a specific host to see a volume.
Host set allows any host that is a member of the host set to see a volume.
Port presents allows any host on a specific port to see the volume.
Matched set allows only a specific host on a specific port to see the volume.

Host Sees

A host sees VLUN template allows only a particular host connected to any port to see a virtual
volume. The system makes the virtual volume visible as a LUN to all the host's WWNs, regardless
of which controller node port the WWNs appear on. If the host has more than one WWN, active
VLUNs are created for each host WWN. However, for any single host, there can only be one host
sees VLUN template for a given LUN.
If a WWN is added to an existing host definition, all virtual volumes that are exported to the host
using the host-sees VLUN template are exported to the new WWN. However, WWNs cannot be
removed from a host definition if a LUN is exported to the host.

Host Set

A host set VLUN template allows any host that is a member of the host set to see a volume. The
system makes the virtual volume visible as a LUN to all the members of the host set. Any hosts
added to the host set automatically see the VLUN, provided there are no conflicting LUN IDs. If
the added host has an exported LUN ID in the LUN ID range of the host set, the host cannot see
the LUN and must be assigned a new ID. If a host is removed from a host set, the removed host
loses all rights of the host set and cannot access volumes exported to the host set.

Port Presents

A port presents VLUN template allows any host connected to a particular port to see a virtual
volume. The system makes the virtual volume visible as a LUN to any of the host's WWNs that
appear on the controller node port. As long as the VLUN template remains on the system, additional
Exporting Virtual Volumes 49