Resize2fs doesn't extend my file system to the size of the partition

Question

I have a 1 TB hdd but when I run df -h my root partition is only 888G big.Parted -l shows the following

3      32.2GB  1000GB  968GB   primary               raid

mdstat shows this

md2 : active raid1 sdb3[1] sda3[0]
  945363832 blocks super 1.2 [2/2] [UU]

But when I run resizefs it reports that the filesystem is full and can't be enlarged as follows.

sudo resize2fs  /dev/md2
resize2fs 1.42.9 (4-Feb-2014)
The filesystem is already 236340958 blocks long.  Nothing to do!

Any ideas how to get around this? I really need the rest of the hdd for backups.

Umount it first , then run the resize command and the reboot the box , and then report the size by df -h — Ijaz Ahmad, Jan 05 '16 at 12:22
1K Blocks `/dev/md2 930398424 797672312 85441540 91% /` 4K Blocks `/dev/md2 232599606 199418144 21360319 91% /` So, with 4K blocks it more or less adds up to resize2fs output. — Wayne Gemmell, Jan 05 '16 at 12:24
@IjazKhan I can't unmount it, it's and I don't have access to a bootable CD. I have restarted it though to check if the blocksize is cached. — Wayne Gemmell, Jan 05 '16 at 12:27

score 2 · Answer 1 · answered Jan 05 '16 at 14:33

There's nothing wrong here.

The confusing thing: df shows you gibibytes, not gigabytes (https://en.wikipedia.org/wiki/Gibibyte).

The last 13GB can be attributed to filesystem overhead

Edit:

other filesystems, e.g. XFS, have less filesystem overhead
if you need more space as non-root, see Reserved space for root on a filesystem - why?. But also read the warnings!

1 Answers1