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Home -> Community -> Mailing Lists -> Oracle-L -> JFS Options
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size=2>convosync dictates the synchronous writes behaviour, mincache the asynchronous writes. The direct option indicates that the system buffer cache will not be used (neither for reads nor for writes), thus avoiding double buffering. dsync means "data synchronous": the file inode will not be updated synchronously if only the time (mtime) needs to be updated. Data are copied synchronously on disk, but a copy is cached. The advice given looks good to me. Online JFS must indeed be separately purchased.HTHChristian Bilien> ---------- Debut du message initial -----------> > De : root_at_fatcity.com> A : Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>> Copies : > Date : Mon, 30 Apr 2001 07:05:19 -0800> Sujet : FILE SYSTEM BUFFER IN JFS : ON OR OFF> > Hi List ,> I posted this on friday but didn't see it on the list> so I am posting this again . I am redesigning a major> system and particular attension is being given to> filesystem configuration and IO . I got this from one> supposedly top not
ch Unix performance tuning expert .> I would like to know if anybody implemeted this and> what are the impacts .> > "The options you want are mount options available only> with Online JFS (not a free product, unfortunately.) > The options you want are:> RBS & TEMP files : mincache=3Ddsync, convosync=3Ddsync> DATAFILES & REDO files : mincache=3Ddirect,> convosync=3Ddirect> "> TIA> regards,> RS
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