Tuning Disk I/O

• Sequential Vs Random I/O
• onstat -p, Read Cache >= 95%, Write Cache >=85%
• onstat -g ioq, onstat -g iof, onstat -g ppf
• Read Ahead Values
  • OLTP - RA_PAGES = 32, RA_THRESHOLD = 28
  • DSS - Increase Until Benefit Ceases, Start With 128, 124

Previous slide

Next slide

Back to first slide

View graphic version