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

Страница: 547 / 828

Chapter 15. Performance considerations
517
15.6.6 Journal-based incremental backup
Using journal-based incremental backup (JBB) can provide substantially faster
incremental backups of file systems with a large number of files with small daily
change rates. Configuration of the journal options is done in the tsmjbbd.ini file in
the client install directory. See the file for supported settings and configurable
parameters. To show you the difference between a classic incremental and JBB
type of backup, we created a file system with more than 240,000 objects and
collected an instrumentation trace for an incremental backup when only a single
file has been changed. The statistics for the backup without JBB are shown in
Example 15-22.
Example 15-22 Incremental backup, no journal
TSM Client final instrumentation statistics: Thu Feb 23 16:43:53 2006
Instrumentation class: Client detail
Completion status: Success
------------------------------------------------------------------
------------------------------------------------------------------
Detailed Instrumentation statistics for
Thread: 1029 Elapsed time 406.568 sec
Section Actual (sec) Average(msec) Frequency used
------------------------------------------------------------------
Process Dirs 0.000 0.0 0
Solve Tree 0.000 0.0 0
Compute 0.000 0.0 3
BeginTxn Verb 0.000 0.0 1
Transaction 0.004 3.9 1
File I/O 0.002 0.5 4
Compression 0.000 0.0 0
Encryption 0.000 0.0 0
CRC 0.000 0.0 0
Delta 0.000 0.0 0
Data Verb 0.005 1.7 3
Confirm Verb 0.000 0.0 0
EndTxn Verb 0.010 10.1 1
Sleep 0.010 10.0 1
Thread Wait 406.429 406429.1 1
Other 0.108 0.0 0
------------------------------------------------------------------
Detailed Instrumentation statistics for