HP 3PAR StoreServ Concepts Guide: HP 3PAR OS 3.1.3

System Tuner allows you to:
• Perform physical disk performance tuning on an entire system or on a specified subset of disks.
• Set performance thresholds for physical disk tuning.
• Identify and relocate under-performing chunklets.
System Tuner tasks can only be performed with the HP 3PAR CLI. See the HP 3PAR Command Line
Interface Administrator’s Manual for instructions on performing these tasks.
HP 3PAR Thin Conversion Software
HP 3PAR Thin Conversion Software is an optional feature that converts an FPVV to a TPVV. Virtual
volumes with large amounts of allocated but unused space are converted to TPVVs that are much
smaller than the original volume. During the conversion process, allocated but unused space is
discarded, and the result is a TPVV that uses less space than the original volume. To convert volumes
located on a system, you must have an F-Class, T-Class, StoreServ 10000, or StoreServ 7000
Storage system to perform the copy operation.
The conversion process has four steps.
1. Assessment.
2. Data preparation.
3. Zeroing unused space.
4. Creating a physical copy.
Assessment
Before converting your volumes, you must determine the benefits of the conversion process. The
potential benefits of zeroing free space prior to copying or migrating the data to a TPVV depends
on the amount of allocated but unused space. If there is relatively little unused space in the allocated
physical space, then there is little benefit to zeroing the free space to recapture this relatively small
amount of space. Many volumes that have been in use for a long time have significant amounts
of allocated but unused space. If there is a large amount of unused space in the allocated physical
space, then zeroing the data prior to copying the data results in a substantial reduction in the
amount of used space.
Data Preparation
Prepare your data for copying by removing unnecessary data. Perform clean-up tasks on the source
volume by:
• Emptying trash cans or permanently deleting files.
• Archiving unused files.
• Shrinking databases.
• Deleting temporary files.
Zeroing Unused Space
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.
Creating a Physical Copy
After writing zeros to the allocated but unused space, the source volume is ready for the final phase
of conversion. You create a TPVV physical copy of the source volume to convert the source volume
to a TPVV. When you create a physical copy, F-Class, T-Class, StoreServ 10000, and StoreServ
56 Enhanced Storage Applications