IBM E16RMLL-I - Tivoli Storage Manager, Руководство по внедрению

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Chapter 15. Performance considerations
493
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