I've noticed that most tuning guides (ex.: DU, oracle) tell you about
"high" or "low" values. For example: "If the disk activity is too high",
"If your system is paging heavily", etc... The manuals tell you how to fix
a problem, but they give you no clue for determining if you indeed have a
problem. I mean, you need a reference point to know if you are over or
under a certain limit. I want to know what these key values are.
Example questions:
"What is a HIGH I/O rate, what is a NORMAL I/O rate, etc...". Where can I
get the information ? It probably depends on the underlying hardware, but
where can I determine what is the EXPECTED level of performance of, say, a
disk device ?
It is the same with paging/swapping. With vmstat, what should I look at, to
determine if my system is paging or swapping TOO much or not ?
I'm trying to get the maximum performance from my servers and I don't have
any reference of what "good performance" or "normal performance" is.
Any pointers, discussions, would be appreciated.
Thanks !
Guy Dallaire
dallaire_at_total.net
"God only knows if god exists"
Received on Wed Mar 19 1997 - 16:42:00 NZST