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After extending my LVM I got a mismatch when using df -kh. 

Filesystem              Size  Used Avail Use% 
/dev/mapper/Data-Media   11T  5,1T  5,3T  49%

However the usage is correct. Any suggestions on how to fix this?

Benjh
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  • This could be a simple rounding error. Show us the output in megabytes. – meskobalazs Aug 24 '15 at 11:05
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    It is a rounding error. @meskobalazs bytes would be even better >:-D – Rinzwind Aug 24 '15 at 11:13
  • Yeah, but I'd rather not use a calculator, if it is not neccessary :) – meskobalazs Aug 24 '15 at 11:14
  • What meskobalazs said, but it still could be not enough. If you want to do the math precisely use bytes: df -k -B 1 – kos Aug 24 '15 at 11:19
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    Thanks guys! Here is it is in bytes. /dev/mapper/Data-Media 11907648708608 5501401092096 5806113181696 49% – Benjh Aug 24 '15 at 11:28
  • I deleted my answer, because not even using bytes makes those numbers right. I don't understand how df is doing those calculations. This is what I get: 11907648708608 B * 49 / 100 = 5834747867217.92 / 1024^4 T = 5.3066722714155912 T =~ 5.3T and 11907648708608 B * 51 / 100 = 6072900841390.08 / 1024^4 T = 5.5232711396366358 =~ 5.5T – kos Aug 24 '15 at 12:15
  • Okay I was reading wrong. Your last awnser makes sense now! Thanks for the help! – Benjh Aug 24 '15 at 15:37

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