[Orca-users] FW: Capacity Planning

[Edwards, Mark]

> Hi,
> 
> I have been asked to produce a capaity plan for one of the platforms that
> our company runs, however the platform appears to be RAM bound at the
> moment. (Page Scan rates high and residency times low at times of peak
> demand). I am also noticing an potential issue with CPU usage. These
> servers have 6 CPU's on board and 5Gb RAM, however looking at the
> description you have given of the 'CPU usage' graph - particuarly where
> you say:
> 
> "If idle time is always low, check the number of processes in the run
> queue. More, or faster, CPUs may be necessary. If user CPU time is
> commonly less than system CPU there may be problems with the system set
> up."
> 
> I am noticing a consistent difference between the user and system CPU
> usage where the user CPU usage indeed appears to be less than the system
> CPU usage. Might this be additional evidence of a RAM bound state - high
> amounts of VM swappage going on?
> 
>  <<o___usr_pct,__sys_pct,__100_-_usr_pct_-_sys_pct-weekly.png>>  
> <<o___scanrate-daily.png>>  <<o___page_rstim-daily.png>> 
> 
> Please forgive me for asking this of you, but I am a tad new to capacity
> planning and graph interpretation, and looking for some assistance...
> 
> Mark
> 
> Mark P. Edwards 
> Pacific Access IT
> MarkE at pacificaccess.com.au
> +61 3 9281 3522
> +61 407 322 033
> 

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