User manual HP STORAGEWORKS LIBRARY AND TAPE TOOLS

[. . . ] HP StorageWorks Library and Tape Tools User Guide Product Version: 4. 2 HP StorageWorks Library and Tape Tools (L&TT) is a comprehensive application that provides functions for identifying, testing, updating, and troubleshooting a wide variety of data storage hardware and media. *5697-6285* Part number: 5697­6285 Seventeenth edition: (November 2006) Legal and notice information © Copyright 2002-2006 Hewlett-Packard Development Company, L. P. Hewlett-Packard Company makes no warranty of any kind with regard to this material, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose. Hewlett-Packard shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing, performance, or use of this material. This document contains proprietary information, which is protected by copyright. [. . . ] File Tree Breadth--Specify the number of directories to be created within each subdirectory (suggested starting value is 5). Files Per Directory--Specify the number of files to be created within each subdirectory (suggested starting value is 50). NOTE: The gauges in the Disc Capacity section of the screen show the amount of disk space required for the System Performance test using the current settings, and the amount of space available in the indicated file system. If the required space exceeds the available space, the Test Size gauge displays OVERFLOW, and you will be unable to start the test. Progress of the test is displayed in the status bar to the right of the Start button, and a dialog box will inform you when the test is complete. Click the System Performance Results tab to view the test results. Performing the System Performance Backup Pre-Test This test reads data from up to four separate locations on the file system. The reads are concurrent and simulate up to four concurrent backup data streams. The performance of these reads is measured and reported in the System Performance Results tab. Use this test to measure the performance of the file system to be used for backup. Use this test in conjunction with the Drive Performance Test to identify performance bottlenecks in the system. This test is read-only and can be safely run on backup source data. NOTE: In the following procedure, a suggested starting value is given for each parameter. These are not necessarily default values, but they are general values that will result in a simple, representative test. Use them as a starting point, and modify them according to your needs. Click the Backup Pre-Test tab. Library and Tape Tools User Guide 93 Figure 21 Backup Pre-Test tab of the System Performance screen 3. Specify the following parameters: · Read Size--Enter the maximum block size (in bytes) to transfer (suggested starting value is 512K). · Directory Traverse Method--Specify one of the following options (suggested starting value is depth): · Specify Depth to have the test read as far down the directory structure as possible before moving laterally to the next directory. · Specify Breadth to read all directories at the same level before moving down to the next subdirectory level. · Stop After--Specify a time limit for the test, or select "All Readers Complete" to continue testing until the test is complete (suggested starting value is 5 minutes). · Reader [1-4]--Enter up to four target directories from which the test will read data. For each Reader, you must have first performed a Restore Pre-Test. Use the same directory or directories that you specified in the Restore Pre-Tests. The number of readers to use depends on your backup application. [. . . ] As a result, you cannot run L&TT and a backup application at the same time. If a backup application is still running, L&TT is unable to gain access to the tape drives, and functionality in L&TT is restricted. Similarly, if L&TT is running and a backup application tries to execute a scheduled job, the job may fail because it cannot access the drive. It should be noted that backup applications refers to service processes, drivers, or typical backup software applications. [. . . ]