Help in monitoring performance problem in Linux


 
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Operating Systems Linux Help in monitoring performance problem in Linux
# 15  
Old 02-14-2010
If it is 2 disk RAID 5 then it is an utter waste of time and explains the poor I/O performance, take the two disks and mirror one against the other instead.
# 16  
Old 04-11-2010
It's real hard to tell how frequently you're monitoring your statistics and unless you're looking at them very frequently, say every 10 seconds or so, you don't get a lot of help from your data. I do know the default sampling rate for sar is one sample every 10 minutes which might have made sense 20 years ago when computers were a lot slower but make no sense today. When sar tells you your cpu is loaded at 20%, how do you know it wasn't 100% for 2 minutes and 0 for 8? Same holds for everything else.

Personally I find looking at a single number and saying this is the CPU or network loads, isn't all that helpful either since nothing is constant. I find seeing numbers every second or so over a period of time when problems exist are much more helpful, but that's me...

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