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IO Issues in linux servers


IO related apps ends up by wasteing cpus , mainly in case of Disk operations, as most languages or codes does not has any Async Disk IO utility . Therefore as to maximize optimization of resource utilization we must try and reduce iowait time of machine .
According to my observation issues will come when you have the disk attached outside the server , i.e. NAS , DAS , SAN , Nfs setups , so be sure which kind of setup you have for the disks , 
40% above I/o utilization is problem .  Below 40 % it should work normally , but again lower values are more preffered ones of course .

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