[ubuntu] Home Directory using 1TB of 4TB: How do I re-size? topic

Hello,

I am very much Linux challenged and I have question regarding disk allocation and usage. To start I checked how much space each partition has using df -h. This gave me the following information:

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Filesystem      Size    Used Avail  Use%  Mounted on
/dev/md2      1008G  1.3G  956G  1%    /
udev              7.7G    4.0K  7.7G    1%    /dev
tmpfs            1.6G  296K  1.6G    1%    /run
none              5.0M      0    5.0M    0%    /run/lock
none              7.7G      0    7.7G    0%    /run/shm
cgroup          7.7G      0    7.7G    0%    /sys/fs/cgroup
/dev/md1      496M  38M  433M    8%    /boot
/dev/md3      4.5T  1.1T  3.2T    24%  /home

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I then ran du /home to see how much space is allotted to the home directory. The key line is as follows:

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1071327568        /home

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The value shows that only about 1TB is actually being used by the system. My question is, how do I expand the space on this partition to make use of what's available?

Thanks to all that reply,

Mike