HP 3PAR StoreServ 7400 4-node HP 3PAR Command Line Interface Administrator& - Page 81
Consolidating Common Provisioning Group Space, Removing a Common Provisioning Group, Virtual Volume
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To set or modify a CPG's autogrow size, issue the setcpg -sdgs command, where: • -sdgs is the amount of LD storage created during each autogrow operation. For the minimum default growth sizes per number of nodes, see Table 6 (page 78). • is the name of the CPG being created. Consolidating Common Provisioning Group Space Compacting a CPG allows you to reclaim space from a CPG that has become less efficient in space usage from creating, deleting, and relocating volumes. Compacting consolidates LD space in CPGs into as few LDs as possible. To consolidate CPG space, issue the compactcpg or compactcpg command, where: • is the name of the CPG you wish to compact. • is the pattern name to which matching CPGs are compacted. For a complete list of options available for the compactcpg command, see the HP 3PAR Command Line Interface Reference and the HP 3PAR CLI Help. Removing a Common Provisioning Group You cannot remove a CPG that still has virtual volumes provisioned from it. To remove a CPG and the LDs that make up that CPG, issue the removecpg command, where is the name of the CPG being removed. For a complete list of options available for the removecpg command, see the HP 3PAR Command Line Interface Reference and the HP 3PAR CLI Help. Virtual Volume Types There are three types of virtual volumes: • FPVVs • TPVVs • Administrative Volumes Administrative volumes are created by the system and are for system usage only. CAUTION: It is strongly recommended that you do not tamper with the admin volumes. Virtual volumes have three separate data components: • User space is the area of the volume that corresponds to the LD regions in the CPG available to the host. The user space contains the user data and is exported as a LUN to the host. • Snapshot space, also known as copy space, is the area of the volume that corresponds to LD regions in the CPG containing copies of user data that changed since a snapshot of the volume was created. The snapshot space contains the copy data. • Administration space, also known as admin space, is the area of the volume that corresponds to LD regions in the CPG that track changes to the volume since a snapshot was created. The administration space contains pointers to copies of user data in the snapshot space. Administration space is managed by the system, not with the tools you use to manage user and snapshot space. You can increase the size of volumes, the amount of user space, and the amount of snapshot space for volumes as the requirements increase. If the user space and snapshot space use all available space, the HP 3PAR Virtual Copy Software feature's copy-on-write operation will fail. To avoid running out of user space, use TPVVs to automatically draw more user space from a CPG. The HP Virtual Volume Types 81