/dev/dm-1 861G 325M 817G 1% /home

I have a separate luks encrypted /home partition with 861G allocated out of a 931G HDD.

The usage is around 1%, but the availabe space is only 817G.

I am having this problem with multiple Arch-based distros like Manjaro, Antergos. I reported this on their forums, but couldn't find a solution yet. They concluded this might be a problem with inode configuration. So I think this must be a problem irrespective of distros.

Is it possible to configure a separate /home partition on a 1TB HDD?

Why is the reported available space only 817G out of allocated 861G?

  • Which file-system do you use?
    – mattia.b89
    Commented Mar 5, 2017 at 16:56
  • EXT4 on a /home partition.
    – user214767
    Commented Mar 6, 2017 at 5:05

1 Answer 1


It is common to reserve some of the blocks for root, and those are not counted as "available" in df's output. If your filesystem has 5% of reserved blocks and is 861GB, there is 95% of that left, or about 817GB, which is consistent with what you see.

This U+L question may be relevant: Reserved space for root on a filesystem - why?

  • Thanks I figured it out and EXT4 reserves 5% of partition for root privileges and so to avoid fragmentation and other issues.
    – user214767
    Commented Mar 6, 2017 at 5:04
  • with my previous comment, here I was driving at!
    – mattia.b89
    Commented Mar 8, 2017 at 22:14