I am getting a weird output on df -h for one of the partitions. Here is the output:

/var/sdc$ df -kh
Filesystem      Size  Used Avail Use% Mounted on
/dev/sda1       990M  569M  354M  62% /
/dev/sda2       976M  285M  640M  31% /var
/dev/sdc        5.0Z  5.0Z     0 100% /var/sdc

what does Z mean in 5.0Z and how can I free up the space there.


It is in the unit of ZiB (or simply Z).

1 ZiB = 2^70 Bytes

So as you have 5.0Z, multiply it by 5 to get your FS size.

From info df:

     2^70 = 1,180,591,620,717,411,303,424.

Note that, ZB is generally called ZettaBytes (10^21 = 1,000,000,000,000,000,000,000), but ZiB is not given any particular name.

But if we follow the trend, e.g. KB for KiloBytes, whereas KiB is called KibiBytes, similarly this can be named something like ZettiBytes? Again nothing official AFAIK.

Regarding the weird filesystem size:

Check the entry carefully:

/dev/sdc        5.0Z  5.0Z     0 100% /var/sdc

you have created filesystem on the whole disk /dev/sdc, not on any partition of it (e.g. /dev/sdc1, have you created any?), leading to this weirdness. Unmount the filesystem, create necessary partition(s) on the disk, and mount the partition(s) (e.g. could be /dev/sdc1) accordingly to meet your need.

  • is there any way to free up this space. The partition was of 50 GB size . I am new to this and not sure how to free up this space. I can see no file is created on this filesystem – user3034987 Oct 7 '16 at 18:44
  • @user3034987 Are yo sure? If so, then it seems pretty weird. Also that much space seems weird too to me at least. To free up space remove unnecessary files from /var/sdc, also i see df is showing it as `00% used. Is this a local device? – heemayl Oct 7 '16 at 19:07
  • yes its a local device and surprisingly there isn't any files on /var/sdc here is the output ubuntu@UbuntuSource-v2:/mnt$ ls -lah /var/sdc total 0 – user3034987 Oct 7 '16 at 19:08
  • @user3034987 Hmmm. Whats the output of du -sh /var/sdc. Also whats the filesystem? – heemayl Oct 7 '16 at 19:09
  • here is the output ubuntu@UbuntuSource-v2:/mnt$ du -sh /var/sdc 4.0K /var/sdc and its an ext4 filesystem – user3034987 Oct 7 '16 at 19:10

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