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Pardon my newbee-ness, but when I look at my file system with df -h, I see how most of my space is in /dev/sda1. I'd like to add space to /usr, to install hadoop. I am confused about how to re-allocate that space, or if I even need to. Can someone clear up my understanding? Thanks in advance.

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    Could you edit your post to include the output of df? That should make it possible to answer your question accurately. – Oli Aug 8 '14 at 20:50
  • And the output of lsblk as well. – muru Aug 8 '14 at 22:47
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/dev/sda1 is your actual hard drive and that's why it seems to have all of the space. The space you need should be dynamically allocated to /usr and available to hadoop when you install it.

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If you use lsblk as shown here:

$ lsblk
NAME   MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sda      8:0    0 232,9G  0 disk 
├─sda1   8:1    0   487M  0 part /boot/efi
├─sda2   8:2    0 200,5G  0 part /
└─sda3   8:3    0    32G  0 part [SWAP]
sdb      8:176  1   7,5G  0 disk 
└─sdb1   8:177  1   7,5G  0 part /media/hannu/PHONE_CARD
sr0     11:0    1  1024M  0 rom  

you see the contents from partition tables on sda and sdb

sda is the first harddisk.

sda1 - the first partition on sda as it has /boot/efi last on the same line, I can tell that this is where my boot data resides. The content tells which kernel to use, what partition to start reading, how to use it and additionally also holds the actual kernel.

sda2 with a / last on the line, this is the root file system of my Linux installation. ls -l / will show the upper level of the contents.

sda3 - and [SWAP] last on the line - this partition corresponds to the swapfile of Windows machines.

sdb is an USB-memnory stick, here with the ability to mount a microSD card which has one partition; sdb1. The content at this time is readable at /media/hannu/PHONE_CARD/

sr0 is the empty CD/DVD RW device.

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/dev/sda1 is a partition, and from what you say ("most of my space is in /dev/sda1"), I think this is the partition you used for Ubuntu's root (/). Since you are a newbie, I think it is unlikely that you assigned a separate partition for /usr, so /usr is using the same space as everything else (the space in /dev/sda1). So you don't need to reassign any space.

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