IBM E16RMLL-I Implementation Guide - Page 512
How to measure performance
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15.1 How to measure performance In measuring Tivoli Storage Manager performance, you need to fine-tune parameters and run specific testing scenarios. Fine-tuning Tivoli Storage Manager is not just for backup, since the restore window is as important, or more so, than the backup window. Some parameters might improve backup at the expense of restore and vice versa. Or they might improve both operations but require more system resources. You need to determine the best balance in your environment, depending on the frequency and criticality of each backup and restore operation. In most cases where the backup parameters are different from the restore parameters, the backup and restore windows can be maximized. Getting the maximum performance of the system requires performing and recording a series of tests so that the throughput can be tabulated. These tests should encompass both for backup and restore. Tivoli Storage Manager performance can be influenced by various tuning parameters. Tuning these functions for good performance requires diligence and expertise on the part of the installer. The number of parameters that may be set within Tivoli Storage Manager are quite small; it is the tuning of the client, server, and network options that can become very complex. Performance tuning for a single platform function is quite complex, but due to years of experience, it is generally well understood. However, Tivoli Storage Manager functions in the client-server realm typically support many operating systems, work across networks, and accept different communication protocols. Consequently, there are many more factors that affect performance. All of these factors can affect Tivoli Storage Manager performance significantly: Average client file size Percentage of files changed since last incremental backup Percentage of bytes changed since last incremental backup Client hardware (CPUs, RAM, disk drives, network adapters) Client operating system client activity (non-Tivoli Storage Manager workload) Communication protocol type Communication controller hardware Network utilization Network speed Network reliability Server hardware (CPUs, RAM, disk drives, network adapters) Server storage pool devices (disk, tape, optical) Server activity (non-Tivoli Storage Manager workload) Final output repository type (disk, tape, optical) 482 IBM Tivoli Storage Manager Implementation Guide
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