IBM E16RMLL-I Implementation Guide - Page 523
bottleneck can be seen. In Example 15-14 on it is the network. A faster
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By default, the output is sent to the console or administrative display, using a pipe to redirect it to a file. We collected the server instrumentation traces for the backup and the restore attempt. Since we know we are backing up a file of 500 MB it is easy to identify the related threads from the server trace by looking at the Total KB section. Example 15-14 shows the threads for the backup. Example 15-14 Server instrumentation statistics: backup Thread 46 SessionThread (Win Thread ID 2860) 09:47:57.875-->09:48:42.281 Session ID 79 BANDA (AIX) Operation Count Tottime Avgtime Mintime Maxtime InstTput Total KB Network Recv 24752 44.249 0.002 0.000 0.031 11571.4 512024 Network Send 11 0.000 0.000 0.000 0.000 0 Acquire Latch 65 0.000 0.000 0.000 0.000 Acquire XLatch 134 0.000 0.000 0.000 0.000 Thread Wait 2012 0.110 0.000 0.000 0.047 Unknown 0.047 Total 44.406 11530.5 512024 Thread 48 AgentThread (Win Thread ID 1612) 09:47:57.921-->09:48:42.265 C:\TSMDATA\STG\FILECLASS\00000012. Operation Count Tottime Avgtime Mintime Maxtime InstTput Total KB Disk Write 2001 7.030 0.004 0.000 0.016 72867.1 512256 Disk Commit 2 0.047 0.024 0.015 0.032 Acquire XLatch 3 0.000 0.000 0.000 0.000 Thread Wait 2010 37.221 0.019 0.000 0.032 Unknown 0.046 Total 44.344 11551.9 512256 By matching the threads reading and writing data for a single session, the bottleneck can be seen. In Example 15-14 on page 493 it is the network. A faster network would increase backup times. This proves one simple statement: The process can only be as fast as the slowest component involved. But we are interested in why the restore was so slow. So now have a look at those server instrumentation statistics, as shown in Example 15-15. Example 15-15 Server instrumentation statistics: restore Thread 48 AgentThread (Win Thread ID 3192) 10:40:15.890-->10:47:16.890 C:\TSMDATA\STG\FILECLASS\00000012. Operation Count Tottime Avgtime Mintime Maxtime InstTput Total KB Disk Read 2001 9.365 0.005 0.000 0.032 54699.0 512256 Disk Commit 1 0.015 0.015 0.015 0.015 Chapter 15. Performance considerations 493
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