HP 3PAR InForm OS 3.1.1 CLI Administrator's Manual

Validating and Repairing Virtual Volumes
• To verify virtual volumes are valid and repair virtual volumes corrupted by an uncontrolled
system shutdown, issue the checkvv -y|-n <VV_name> command, where:
◦ -y|-n specifies that if validity errors are found they are to be corrected (-y), or left
unmodified (-n). If this option is not specified, errors are not corrected.
◦ <VV_name> is the name(s) of the virtual volume(s) to be validated and repaired.
For a complete list of options available for the checkvv command, see the HP 3PAR InForm OS
Command Line Interface Reference and InForm OS CLI Help.
Exporting Virtual Volumes
Virtual volumes are the only logical storage component visible to hosts. A virtual volume can be
exported, or 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. The maximum number of supported
VLUNs per host is 16,000. The maximum number of supported VLUNs per system is 32,000. For
more information about VLUNs, refer to the HP 3PAR InForm OS Concepts Guide.
NOTE: When adding virtual volume sets, leave a gap between the virtual volume set export and
any further exports to allow for expansion. This example uses the next free VLUN from 100 onwards,
which allows you to take advantage of the auto LUN functionality while retaining separation
between virtual volume set ranges: createvlun <VV_name> 100+
<host>|set:<host_set>.
Creating VLUN Templates
A VLUN template creates 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.
:
If the system is operating in Common Criteria mode, there may be security risks with port presents.
For more information about Common Criteria, see the HP 3PAR InForm OS Common Criteria
Administrator’s Reference.
Validating and Repairing Virtual Volumes 93