HP 3PAR StoreServ 7400 2-node HP 3PAR Command Line Interface Administrator& - Page 86
Manually Converting a Fully Provisioned Virtual Volume to a Thinly Provisioned Virtual Volume
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Manually Converting a Fully Provisioned Virtual Volume to a Thinly Provisioned Virtual Volume To convert an FPVV to a TPVV: 1. For assessment and preparation considerations,, see the HP 3PAR StoreServ Storage Concepts Guide. 2. Prepare the volumes for conversion to the new TPVV by removing unnecessary data. Perform clean-up tasks on the source volume by: • Emptying trash cans. • Archiving unused files. • Shrinking databases. • Deleting temporary files. 3. Use a host application to write zeros to the allocated but unused volume space. F-Class, T-Class, StoreServ 10000, and StoreServ 7000 Storage systems detect and discard the zeros during the volume copy operation. 4. Convert the base volume to a TPVV by creating a physical copy of the volume. Create a physical copy of the base volume with the createvvcopy command. For more information, see "Creating an Offline Physical Copy" (page 98). F-Class, T-Class, StoreServ 10000, and StoreServ 7000 Storage systems detect and discard the zeros during the volume copy operation. The createvvcopy command automatically enables the zero_detect policy on the destination TPVV. After the copy operation is completed, the zero_detect policy is automatically disabled. 5. Use the showvv-s command to view the size of the TPVV created in Step 4. The destination TPVV should use significantly less total reserved space, and have a smaller volume size than the original base volume. 6. Optional. After verifying the data on the converted destination TPVV, you can use the removevv command to remove the base volume converted in Step 4. Reducing Volume Size with HP 3PAR Thin Persistence Software HP 3PAR Thin Persistence Software is an optional feature keeps system TPVVs and read/write snapshots of TPVVs small by detecting pages of zeros during data transfers, and not allocating space for the zeros in the destination TPVV. This feature works in real-time and analyzes the data before it is written to the destination TPVV. You must have an F-Class, T-Class, StoreServ 10000, or StoreServ 7000 Storage system to use Thin Persistence with TPVVs. For more information about the Thin Persistence feature, see the HP 3PAR StoreServ Storage Concepts Guide. To enable the Thin Persistence feature on a TPVV or a read/write snapshot of a TPVV, use the setvv command to enable the zero_detect policy on the destination TPVV. For more information, see "Modifying Virtual Volumes" (page 84). NOTE: Thin persistence can have some performance implications during extremely busy system conditions. HP recommends the zero_detect policy only be enabled during Thin Persistence and Thin Conversion operations. The zero_detect policy should be disabled during normal operation. Maintaining TPVV and read/write snapshot size with the Thin Persistence feature requires an F-Class, T-Class, StoreServ 10000, or StoreServ 7000 Storage system, an HP 3PAR Thin Provisioning Software license, an HP 3PAR Thin Conversion Software license, and an HP 3PAR Thin Persistence Software license. Contact your HP representative for more information. 86 Managing CPGs and Virtual Volumes