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Acquire XLatch
Thread Wait
Unknown
----------------------------------------------------------------------------
Total
Thread 46 SessionThread (Win Thread ID 2604) 10:40:13.437-->10:47:16.906
Session ID 86 BANDA (AIX)
Operation
----------------------------------------------------------------------------
Network Recv
Network Send
Acquire Latch
Acquire XLatch
Thread Wait
Unknown
----------------------------------------------------------------------------
Total
Here we see that the server can read from the storage pool volume with an
instrumented throughput of 54 MBps, but the data is sent back to the client with
only about 1.2 MBps. From the Network Recv section of the backup trace, we
know that the client is sending the data with 24752 verbs, but the server is
sending the data back with only 4017 verbs (Network Send of the restore trace).
This makes us review the client and server communications options, and here
we find the cause of the problem: since we were running with a minimal client
systems option file, we did not specify the DISKBUFFSIZE or the related
ENABLELANFREE option. With ENABLELANFREE set to NO, the
DISKBUFFSIZE on our AIX system defaulted to 256 KB for the DISKBUFFSIZE.
This does not work well with the Windows Tivoli Storage Manager server
communication when it transmits data back to the AIX client. So we specified a
value of DISKBUFFSIZE to 32 and the improved result for the restore is shown
with Example 15-16. The restore time is now down to 46 seconds—success.
Example 15-16 Restore after configuration change
# dsmc res /home/root/500MBFile
IBM Tivoli Storage Manager
Command Line Backup/Archive Client Interface
Client Version 5, Release 3, Level 3.0 0220FB
Client date/time: 02/23/06
(c) Copyright by IBM Corporation and other(s) 1990, 2006. All Rights Reserved.
Node Name: BANDA
Session established with server LOCHNESS_SERVER1: Windows
Server Version 5, Release 3, Level 2.2
Server date/time: 02/23/06
494
IBM Tivoli Storage Manager Implementation Guide
3
0.000
0.000
2007 411.620
0.205
0.000
421.000
Count Tottime Avgtime Mintime Maxtime InstTput Total KB
51
4.344
0.085
4017 419.032
0.104
43
0.000
0.000
105
0.000
0.000
2006
0.061
0.000
0.032
423.469
13:46:40
13:42:24 Last access: 02/23/06
0.000
0.000
0.000
2.172
1216.8
0.000
2.390
0.2
0.000
0.219
1221.9
0.000
0.000
0.000
0.000
0.000
0.031
1209.1
13:27:49
512256
1
512025
512026
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