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Log file sync wait on AIX

edited Dec 8, 2015 4:12AM in Database Tuning (MOSC) 11 commentsAnswered ✓

Hi everyone.

I have a server database: IBM POWER8 with AIX 7.1 (7100-03-04-1441)

The server has a RAID6 with 6 disk. I've installed RDBMS 11gR2 (11.2.0.4).

All RDBMS binaries, datafile, log file,... run on rootvg.

The database has a problem with log file sync wait, and db file parallel write too.

EventEvent Class% EventAvg Active Sessions
db file sequential readUser I/O30.414.25
log file syncCommit26.993.78
read by other sessionUser I/O15.822.21
CPU + Wait for CPUCPU3.730.52
db file parallel readUser I/O2.640.37

I've move redo log to a logical volume with FS blocksize = 512.

iostat -alDRT

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