Re: High numbers of buffer waits in OnLine

In article <DtpnBz.3HC@cix.compulink.co.uk>, "\\"Andy Kent\\"" <akent@cix.compulink.co.uk> writes >Client is noticing large numbers of buffer waits sometimes cropping up >while running a *single* heavyweight job under OnLine 5.04. They've got >plenty of data buffers (12,000) and are getting read caching of 98% and >write caching usually over 90%. LRU parameters are at the defaults - I've >suggested they lower LRU_MAX_DIRTY and LRU_MIN_DIRTY to 30 and 20 to keep >pages cleaner for longer and also possibly LRUs to 4 so it can locate >clean pages more quickly. > >Any comments on this or further ideas of things to try? > >They've got 4 chunks on 4 disks with 4 page cleaners. > >akent@cix.compulink.co.uk (Andy Kent) >------------------------------------------------ >Redland, Bristol, England If you are getting many bugger waits then increase the number of buffers. Ignore the caching percentages, just add more buffers. PS This worked for me. -- David Williams