hi, for Oracle we've found for files that have a high IO rate like temp tablespaces & redo logs that we get a significant performace improvement using DirectIO, so we create a directIO slice just for these types of files. hth ta martin. On Fri, 2006-05-12 at 05:09 +0800, mcclnx mcc wrote: > we have several DELL 6800 with LSI 4e/DC adapter cards > (128 MB cache) in it. DELL 6800 run under Redhar AS > 4.0 and ORACLE 9ir2. When I configured DELL 6800 > server local disks (Mirror or RAID 5), it have two > I/O policy to choice - direct IO and cache IO. > > I doing simple test by copy files between differents > disk set and found "direct IO" performance better > than "cache IO". It is against what I read before. I > used to saw documents from SUN and IBM said "large > disk array cache will improve I/O performance". > > Any one has suggestion FOR ORACLE server which I/O > policy should I setup? > > Thanks. > > ___________________________________________________ 最新版 Yahoo!奇摩即時通訊 7.0，免費網路電話任你打！ http://messenger.yahoo.com.tw/ > -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list
