Host operating system: output of uname -a

Linux master 3.10.0-1062.18.1.el7.x86_64 #1 
<https://github.com/prometheus/node_exporter/pull/1> SMP Tue Mar 17 
23:49:17 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux


node_exporter version: output of node_exporter --version

node_exporter v1.0.1

Are you running node_exporter in Docker?

node_exporter running in kubernetes

What did you do that produced an error?

I use 'node_filesystem_size_bytes' The size of the system disk (DF - H) 
queried by bytes is inconsistent with that on the host.Why are the two 
different? It should be the same value, which causes my monitoring alarm to 
be incorrect

What did you expect to see?

Index node_filesystem_size_bytes query results

/dev/mapper/centos-home:50G
/dev/mapper/centos-root:518.5G

What did you see instead?

(1).'Index node_filesystem_size_bytes' query results

/dev/mapper/centos-home:518.5G
/dev/mapper/centos-root:518.5G


(2).'df -h' query results

/dev/mapper/centos00-root 50G 3.6G 47G 8% /
/dev/mapper/centos00-home 519G 24G 496G 5% /home

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