hi, friends: My db server has one poor t3(raid5, 256M Cache) and it is rather slow in disk io. This night, I added a second T3(256M Cache,Raid10) to the database and moved half of datafiles to the second raid. But it seems from statspack, IO wait is more than before:
Statistic Total per Second per Trans --------------------------------- ---------------- ------------ ------------ CPU used by this session 66,663 23.5 8.2 CPU used when call started 66,692 23.5 8.2 -------------------------------------------- ------------ ------------ ------- db file sequential read 225,846 178,026 93.03 log file sync 8,604 4,167 2.18 log file parallel write 8,665 3,593 1.88 db file parallel write 768 2,455 1.28 now: 66 cpu used /178 cpu waited. But with the old configuration, cpu used vs cpu waited is like: old: 7832 cpu used / 17508 cpu waited -------------------------------------------- ------------ ------------ ------- db file sequential read 10,164,408 17,508,898 83.50 db file parallel write 46,130 1,072,257 5.11 enqueue 90,498 854,241 4.07 Statistic Total per Second per Trans --------------------------------- ---------------- ------------ ------------ CPU used by this session 7,832,321 167.4 9.5 CPU used when call started 7,832,333 167.4 9.5 These snapshot are from different time and different time lengh, but I think after i added a disk array to disk array, IO wait should slowdown, but from the new statspack, relatively more time is spent on io wait? How to explain this? Thanks. -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: chao_ping INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
