3PAR InForm® OS 2.2.4 CLI Administrator's Manual (320-200113 Rev A, March 2009)

7.7
Exporting Virtual Volumes
InForm OS Version 2.2.4 3PAR InForm OS CLI Administrator’s Manual
 <pattern> is the name of the pattern from which snapshot space is to be made
available from all volumes matching that pattern name.
When freeing a volume’s snapshost space, you can also optionally keep the volumes’
underlying logical disks by specifying the
-keepld option when issuing the freespace
command. If not specified, logical disks that are not part of a common provisioning group
(CPG) or logical disks that are unused are removed. For additional information about the
freespace command, see the InForm OS Command Line Interface Reference. For information
about CPGs, see the InForm OS Concepts Manual.
7.7 Exporting Virtual Volumes
A virtual volume can be exported (made accessible) to one or more hosts. The host sees the
exported volume as a LUN connected to one or more ports. Once the virtual volume is
exported to a host, the host can send requests to the LUN.
A volume-LUN, or VLUN, is a pairing between a virtual volume and a logical unit number
(LUN), expressed as either a VLUN template or an active VLUN.
7.7.1 Creating VLUN Templates
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.
 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.
NOTE: The freespace command is only applicable to volumes which do not
have snapshots or volumes which are not TPVVs. For additional information, see
the InForm OS Command Line Interface Reference. For information about TPVVs,
see the InForm OS Concepts Manual.