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                在文件系統層,下面幾個措施可明顯提升IOPS性能: 1、使用deadline/noop這兩種I/O調度器,千萬別用cfq(它不適合跑DB類服務); 2、使用xfs文件系統,千萬別用ext3;ext4勉強可用,但業務量很大的話,則一定要用xfs; 3、文件系統mount參數中增加:noatime, nodiratime, nobarrier幾個選項(nobarrier是xfs文件系統特有的);
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