Performance

Save and restore data transfer performance between the BRMS TSM client and Tivoli® Storage Manager (TSM) is dependent upon several factors which include the current activity on the system, the availability of computing resources on the system, the available network bandwidth, and the TSM server. BRMS does not communicate directly with TSM servers. BRMS uses functions provided by the TSM APIs. The TSM APIs handle all communication with the TSM server.

For save operations, BRMS receives a pointer to the save data and length from the operating system. BRMS passes the pointer and length to the TSM API. The TSM API transfers the save data to the TSM server. The save performance is directly related to the ability of the operating system and BRMS to collect the blocks of save data and the TSM API to send the save data across the network to the TSM server. The slower rate of the save and send rates determines the performance of the save operation.

For restore operations, the BRMS receives requests for blocks of restore data from the operating system. BRMS passes the request to the TSM API. The TSM API manages the transfers of restore data from the TSM server. The restore performance is directly related to the ability of the TSM API to receive blocks of restore data from the TSM server across network, and BRMS and the operating system to restore the objects. The slower rate of the receive and restore rates determines the performance of the restore operation.

You can have BRMS analyze and report recent TSM performance. To do so:

1. On a command line, type GO BRMRPT and press Enter.
2. Run option 53. Print TSM performance analysis.
3. Specify the range of dates, job, user and minimum blocks you want to include in the TSM Performance Analysis Report.
   Note:

   Activity between BRMS and TSM servers is recorded in file /tmp/brms/tsmapis. The report program uses this data to produce the report.

                              Specify Report Criteria                              
                                                                                   
    Type choices, press Enter.                                                     
                                                                                   
    Select dates:                                                                  
      From date . . . . . . . . . . . :   *BEGIN     Date, *BEGIN, *CURRENT        
      To date . . . . . . . . . . . . :   *END       Date, *END, *CURRENT          
    Job number  . . . . . . . . . . . :   *ALL       1-999999, *ALL                
    Job user  . . . . . . . . . . . . :   *ALL       Name, *ALL                    
    Minimum blocks  . . . . . . . . . :   *NONE      1-999999, *NONE               
                                                                                   
                                                                                   
                                                                                   
                                                                                   
                                                                                   
                                                                                   
                                                                                   
                                                                                   
                                                                                   
                                                                                   
                                                                                   
                                                                                   
    F3=Exit   F12=Cancel                                                           
   

4. Press the Enter key to create the report.
5. Use the Work with Spooled Files (WRKSPLF) command to view or print the QP1ATSMRPT report.
   Notes:

   1. The performance data in the report only reflects the time required to transfer data once the operating system initiates a request to send or receive the first block of data. The performance analysis in this report does not include additional processing time required to create the save/restore command or to process the output file.
   2. Averages for transfer rates are more accurate as the number of blocks in the transfer increase. For example, an analysis of transfers consisting of 50 blocks provides a better average than an analysis of transfers consisting of only 5 blocks.