[Nut-upsdev] Asking hard questions about the NUT architecture

Edgar Fuß ef at math.uni-bonn.de
Thu May 31 21:06:24 UTC 2007


> It's a *really* short time, like on the order of 250ms

Could someone please check my maths?

I can push out around 200MB/s to my RAID. That's 50MB in your 250ms.
I have 4G of RAM in our file server. With UBC, this can be 4G dirty  
pages. Or MySQL buffers. Or any other user data.

Our discs have an access time of around 5ms. I can access 50 tracks  
in your 250ms.
So if I have more than some 25 open files, I'll be losing data.

Could someone please check my maths?




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