Journal-Based Incremental Backup - IBM E16RMLL-I - Tivoli Storage Manager Implementation Manual

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
Section
------------------------------------------------------------------
Process Dirs
Solve Tree
Compute
BeginTxn Verb
Transaction
File I/O
Compression
Encryption
CRC
Delta
Data Verb
Confirm Verb
EndTxn Verb
Sleep
Thread Wait
Other
------------------------------------------------------------------
Detailed Instrumentation statistics for
406.568 sec
Actual (sec) Average(msec) Frequency used
0.000
0.000
0.000
0.000
0.004
0.002
0.000
0.000
0.000
0.000
0.005
0.000
0.010 10.1
0.010 10.0
406.429 406429.1
0.108
Chapter 15. Performance considerations
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3.9 1
0.5 4
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1.7 3
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1
1
1
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517