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$ lsblk
xvda1 202:1    0   20G  0 disk /
xvda3 202:3    0  896M  0 disk [SWAP]
$ df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/xvda1      7.9G  2.1G  5.8G  27% /
tmpfs           829M     0  829M   0% /dev/shm

Why does lsblk telling me that I have 20G disk space on xvda1, while df command is telling me I only have 8G disk space?

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I had this same issue. I used sudo resize2fs /dev/xvda1 to make the rest of the disk space available.

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Wonderful, this is exactly what I needed. Thank you. – Malcolm Diggs Apr 22 '14 at 11:32

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