There could be two explanations for this huge file that seems to be
larger than the file system. From the path name it seems that this file
is probably a virtual machine image, so it may contain either a lot of
"empty" data (zero'd) or may have lots of file "holes". So...
1. Is it compressed?
For example, a VM image file containing lots of zeros can be very
efficiently compressed, hence it's compressed size is very small but can
appear to be much larger than the real size used in the zfs file system.
2. Does the image have "holes"?
VM image files may just use space that is non-zero and the zero'd data
blocks are not physically stored on the zfs file system.
You can see the real physical size of the file using 'du -h' on the
file, e.g.
/data/store/vms/plexee/plexee-root
..that should tell you the size of the file as really used on the file
system rather than the size of the file as it appears when you read it.
** Changed in: zfs-linux (Ubuntu)
Status: Confirmed => Triaged
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https://bugs.launchpad.net/bugs/1766308
Title:
inexplicably large file reported by zfs filesystem
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