IBM E16RMLL-I - Tivoli Storage Manager Implementation Manual page 523

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
Network Send 11
Acquire Latch 65
Acquire XLatch 134
Thread Wait 2012
Unknown
----------------------------------------------------------------------------
Total
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
Disk Commit 2
Acquire XLatch 3
Thread Wait 2010
Unknown
----------------------------------------------------------------------------
Total
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
Disk Commit 1
44.249 0.002 0.000
0.000 0.000 0.000
0.000 0.000 0.000
0.000 0.000 0.000
0.110 0.000 0.000
0.047
44.406
7.030 0.004 0.000
0.047 0.024 0.015
0.000 0.000 0.000
37.221 0.019 0.000
0.046
44.344
9.365 0.005 0.000
0.015 0.015 0.015
Chapter 15. Performance considerations
0.031 11571.4 512024
0.000 0
0.000
0.000
0.047
11530.5 512024
0.016 72867.1 512256
0.032
0.000
0.032
11551.9 512256
0.032 54699.0 512256
0.015
493