494
IBM Tivoli Storage Manager Implementation Guide
Acquire XLatch 3 0.000 0.000 0.000 0.000
Thread Wait 2007 411.620 0.205 0.000 2.172
Unknown 0.000
----------------------------------------------------------------------------
Total 421.000 1216.8 512256
Thread 46 SessionThread (Win Thread ID 2604) 10:40:13.437-->10:47:16.906
Session ID 86 BANDA (AIX)
Operation Count Tottime Avgtime Mintime Maxtime InstTput Total KB
----------------------------------------------------------------------------
Network Recv 51 4.344 0.085 0.000 2.390 0.2 1
Network Send 4017 419.032 0.104 0.000 0.219 1221.9 512025
Acquire Latch 43 0.000 0.000 0.000 0.000
Acquire XLatch 105 0.000 0.000 0.000 0.000
Thread Wait 2006 0.061 0.000 0.000 0.031
Unknown 0.032
----------------------------------------------------------------------------
Total 423.469 1209.1 512026
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 13:46:40
(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 13:42:24 Last access: 02/23/06 13:27:49
Summary of Contents for E16RMLL-I - Tivoli Storage Manager
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