HP 3PAR StoreServ 7400 2-node HP 3PAR Command Line Interface Administrator& - Page 95
Managing Virtual Volume Copies, Virtual Copies, Creating a Virtual Copy
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7 Managing Virtual Volume Copies There are two types of copies that can be created from virtual volumes: virtual copies and physical copies. • A virtual copy is a snapshot of an original or base volume. A virtual copy only records the changes to the original virtual volume. • A physical copy is a complete duplicate of all the data from a base volume to a destination volume. For more information about virtual copies, see the HP 3PAR StoreServ Storage Concepts Guide. NOTE: Creating TPVVs requires the HP 3PAR Thin Provisioning Software license. Creating virtual copies or snapshots requires the HP 3PAR Virtual Copy Software license. NOTE: If your system is accessible in an OpenStack cloud, you may see volumes with prefixes indicating that the volumes were created through the OpenStack cloud. Volumes created through the OpenStack cloud use the OpenStack Volume (OSV) and OpenStack Snapshot (OSS) prefixes. Virtual Copies A virtual copy is a snapshot of another virtual volume. You can make virtual copies of base volumes, physical copies, or other virtual copies. Virtual copies are created using copy-on-write techniques available only with the HP 3PAR Virtual Copy Software license. Unlike a physical copy which duplicates the entire base volume, a virtual copy only records the changes to the original volume. This allows an earlier state of the original volume to be recreated by starting with the current state and rolling back all of the changes that have been made since the virtual copy was created. You can use the HP 3PAR CLI to perform the following virtual copy tasks: • Create • Promote • Modify • Remove For additional information about virtual copies, see the HP 3PAR StoreServ Storage Concepts Guide. Creating a Virtual Copy Virtual copies can be read-only or read/write. Read-only and read/write copies must alternate. You can only make a read-only copy of a read/write volume and a read/write copy of a read-only volume. Expiration dates can be set for virtual copies to save space. The system allows you to make a maximum of 500 virtual copies of a base volume. Up to 256 virtual copies can be read/write copies. The maximum number of virtual copies that can be created on a system is determined by the system configuration. For the maximum number of virtual copies that can be created with your specific system configuration, see the SPOCK website: http://www.hp.com/storage/spock To create a virtual copy, or snapshot, of a virtual volume or a virtual volume set, issue the createsv -ro |set: command, where: • -ro specifies that the snapshot being created is read-only. • is the name of the snapshot being created. Virtual Copies 95