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• -usr_aw is the allocation warning alert limit for the user space specified as apercentage. This generates an alert when the user space of the volume exceeds a specifiedpercentage of the volume’s size.• -usr_al is the allocation limit of the user space specified as a percentage.This prevents the user space from exceeding a specified percentage of the volume’s size.• is the name of the CPG from which the created virtual volume will draw its userspace.• is the name of the volume being created. The name can be up to 31 characters.• is the size of the volume in MB, GB, or TB. If g|G|t|T is not specified,VV_size is the number of MBs. For example, 50g specifies 50 GBs.For a complete list of options available for the createvv command, see the HP 3PAR CommandLine Interface Reference and the HP 3PAR CLI Help.Modifying Virtual VolumesExisting virtual volumes can be modified to use a new name, draw space from a different CPG,set allocation warnings, or to use new policies.To modify a volume to draw its snapshot space and administration space from a different CPG,issue the setvv -snp_cpg -usr_cpg command,where:• is the name of the CPG from which the modified volume will draw its snapshotspace and administration space.• is the name of the CPG from which the modified virtual volume will draw itsuser space.• is the name of the virtual volume being modified.For a complete list of options available for the setvv command, see the HP 3PAR Command LineInterface Reference and the HP 3PAR CLI Help.Growing Virtual VolumesYou can increase the size of, or grow, an existing virtual volume’s user space automatically whenthe volume reaches capacity.To automatically increase the user space available to a virtual volume when the volume reachescapacity, issue the growvv g|G|t|T> command, where:• is the name of the virtual volume you are growing.• is the amount of space automatically added to the user space in MB, GB,or TB. If g|G|t|T is not specified, VV_size is the number of MBs.For a complete list of options available for the growvv command, see the HP 3PAR CommandLine Interface Reference and the HP 3PAR CLI Help.Converting Virtual Volumes OnlineYou can convert existing fully-provisioned virtual volumes to TPPVs, and you can convert TPVVs tofully-provisioned virtual volumes on the array, without disrupting normal storage system operationsand without requiring changes to any host applications that access the virtual volumes. If a TPVVis using most of its allocated storage capacity, you can convert the volume to a fully-provisionedvirtual volumes in order to increase its storage capacity and allow for continued growth of thevolume. When a TPVV reaches approximately 80% of capacity, the incremental benefit of capacitysavings versus accelerating performance is weighted towards performance. In addition, convertingTPVVs to fully-provisioned virtual volumes can free up thinly-provisioned capacity for other TPVVs.84 Managing CPGs and Virtual Volumes |
