HP 3PAR StoreServ 7450 4-node HP 3PAR StoreServ Storage Concepts Guide (OS 3.1 - Page 9

Physical Copies, Virtual Copy Snapshots, Exporting Virtual Volumes, HP 3PAR Software

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TPVV volume size limit is 16 TB. For more information about TPVVs, see "Thinly-Provisioned Virtual Volumes" (page 43). NOTE: Creating TPVVs requires the HP 3PAR Thin Provisioning Software license. For more information, see "HP 3PAR Software" (page 9). Physical Copies A physical copy is a full copy of a volume. The data in a physical copy is static; it is not updated with subsequent changes to the parent volume. The parent volume is the original volume that is copied to the destination volume. The parent volume can be a base volume, volume set, virtual copy, or physical copy. Creating physical copies does not require a separate license. A physical copy can be created only from a parent volume with enough free space to accommodate writes to that volume during the physical copy operation. Physical copies can be online physical copies or offline physical copies. For online physical copies, the destination volume is automatically created and can be exported immediately. Offline physical copies require a destination volume that must have a user space size at least as large as the user space of the base volume being copied, and offline physical copies cannot be exported. For additional information about physical copies, see "Physical Copies" (page 45). NOTE: With an HP 3PAR Remote Copy Software license, physical copies can be copied from one HP 3PAR storage system to another by using Remote Copy. For additional information, see the HP 3PAR Remote Copy Software User's Guide. Virtual Copy Snapshots A snapshot is a virtual copy of a base volume. The base volume is the original volume that is copied. Unlike a physical copy, which is a duplicate of an entire volume, a virtual copy only records changes to the base volume. This allows an earlier state of the original virtual volume to be recreated by starting with the current state of the virtual copy and rolling back all the changes that have been made since the virtual copy was created. You can make snapshots of: FPVVs, TPVVs, physical copies, or another virtual copy snapshot. Snapshots are created by using copy-on-write techniques available only with the HP 3PAR Virtual Copy Software license. Thousands of snapshots of each virtual volume can be created assuming that there is sufficient storage space available. For additional information on virtual copies, see "Virtual Copy Snapshots" (page 46). NOTE: An HP 3PAR Virtual Copy license is required to create virtual copies. For more information, see "HP 3PAR Software" (page 9). Exporting Virtual Volumes For a host to see a virtual volume, the volume must be exported as a LUN. Volumes are exported by creating Virtual Volume-LUN pairings (VLUNs) on the system. 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. For more information about active VLUNs, VLUN templates, and VLUN template types, see "Exporting Virtual Volumes" (page 48). HP 3PAR Software In addition to HP 3PAR Operating System Software, HP offers separately licensed software suites, optional software features, and a set of host-based software applications. You can use the HP 3PAR Command Line Interface (CLI) Software and the HP 3PAR Management Console Software to view the licenses currently enabled on your system. HP 3PAR Software 9

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TPVV volume size limit is 16 TB. For more information about TPVVs, see
“Thinly-Provisioned Virtual
Volumes” (page 43)
.
NOTE:
Creating TPVVs requires the HP 3PAR Thin Provisioning Software license. For more
information, see
“HP 3PAR Software” (page 9)
.
Physical Copies
A physical copy is a full copy of a volume. The data in a physical copy is static; it is not updated
with subsequent changes to the parent volume. The parent volume is the original volume that is
copied to the destination volume. The parent volume can be a base volume, volume set, virtual
copy, or physical copy. Creating physical copies does not require a separate license.
A physical copy can be created only from a parent volume with enough free space to accommodate
writes to that volume during the physical copy operation. Physical copies can be online physical
copies or offline physical copies. For online physical copies, the destination volume is automatically
created and can be exported immediately. Offline physical copies require a destination volume
that must have a user space size at least as large as the user space of the base volume being
copied, and offline physical copies cannot be exported.
For additional information about physical copies, see
“Physical Copies” (page 45)
.
NOTE:
With an HP 3PAR Remote Copy Software license, physical copies can be copied from
one HP 3PAR storage system to another by using Remote Copy. For additional information, see
the
HP 3PAR Remote Copy Software User’s Guide
.
Virtual Copy Snapshots
A snapshot is a virtual copy of a base volume. The base volume is the original volume that is
copied. Unlike a physical copy, which is a duplicate of an entire volume, a virtual copy only
records changes to the base volume. This allows an earlier state of the original virtual volume to
be recreated by starting with the current state of the virtual copy and rolling back all the changes
that have been made since the virtual copy was created.
You can make snapshots of: FPVVs, TPVVs, physical copies, or another virtual copy snapshot.
Snapshots are created by using copy-on-write techniques available only with the HP 3PAR Virtual
Copy Software license. Thousands of snapshots of each virtual volume can be created assuming
that there is sufficient storage space available. For additional information on virtual copies, see
“Virtual Copy Snapshots” (page 46)
.
NOTE:
An HP 3PAR Virtual Copy license is required to create virtual copies. For more information,
see
“HP 3PAR Software” (page 9)
.
Exporting Virtual Volumes
For a host to see a virtual volume, the volume must be exported as a LUN. Volumes are exported
by creating Virtual Volume-LUN pairings (VLUNs) on the system. 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. For more information about active VLUNs, VLUN templates,
and VLUN template types, see
“Exporting Virtual Volumes” (page 48)
.
HP 3PAR Software
In addition to HP 3PAR Operating System Software, HP offers separately licensed software suites,
optional software features, and a set of host-based software applications. You can use the HP
3PAR Command Line Interface (CLI) Software and the HP 3PAR Management Console Software
to view the licenses currently enabled on your system.
HP 3PAR Software
9