HP 3PAR StoreServ 7400 2-node HP 3PAR StoreServ Storage Concepts Guide (OS 3.1 - Page 55
HP 3PAR Thin Conversion Software, Assessment, Data Preparation
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If the performance of one or more physical disks degrades, the throughput of the logical disks is reduced and the entire system performance may decline. There are two general reasons why a physical disk may have degraded performance: • The physical disk has reached its maximum throughput due to an unbalanced load. A disk in this state typically has unusually high average service times when compared to other disks. • The physical disk is a bad disk. A bad disk typically has unusually high maximum service times when compared to other disks. 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 Command Line Interface (CLI). Refer to the HP 3PAR Command Line Interface Administrator's Manual for instructions on how to perform these tasks. HP 3PAR Thin Conversion Software HP 3PAR Thin Conversion Software is an optional feature that converts a fully-provisioned volume to a Thinly-Provisioned Virtual Volume (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. HP 3PAR Thin Conversion Software 55