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explained ext4 fs limit
== Internals ==
=== Image size limit ===
Ploop v1 image size limitation comes from the fact that unsigned 32 bit integer
Same as with ploop v1, the first megabyte of the image is
used for header and L2 translation table, maximum image size is decreased by 1MB.
=== Filesystem size limit ===
Currently ext4 file system is used. An ability to resize ext4 is limited by
its block group descriptor table, which size can be specified during file
system creation time, using <code>-Eresize</code> option to mke2fs.
Currently ploop library hardcodes this value so that filesystem can be resized
up to 16 TB of space.