Where can I find out the log files location? because it seems i have 10+GB of log!!!

I have a problem
within 6 hours, my server has used up 57% HD, but I am very sure it was 20%

then i asked the tech and they said is the log files

but where can I find the log files?
i went everywhere but i still couldn't find the large one!

Please help guys!

Thanks

 

 

 

 

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