In this forum I read in the OpenMediaVault FAQ article by WastlJ:
<<<
12. What filesystem should I use on my data drive(s)?
PLEASE format your data drives with EXT3/EXT4. With other filesystems
like NTFS you´ll run into problems as soon as you create your first
folder because of the privileges!
>>>
Can anybody please elaborate, how and under which circumstances the privelege problems occure?
To try out, I attached some external NTFS formatted USB drives (most contents were already there) to my HP microserver with OVM 2.2.25. I accessed the drives, created directories, copied files inside, edited the files and deleted them. No problem so far. Not many tests either.
For all internal drives, I am using ext4, but for the external drive, NTFS is convenient at the moment because of hopefully easy usage together with Windows type OS. I just like to understand the concrete nature of the problems, to be able to better plan, how to set things up.
[BTW., using ext4 was not without problems. Using a disk formated to ext4 by gparted-live-cd yields in confusing error messages ("special file missing" or similar). In dmesg, I then found the real reason was, that gparted obviously used some newer ext4 features (#400), which are not supported on OMV 2.2.25 an which will make mounting the disk fail. Formatting the disk with OMV allowed mounting again. Seems to show, that ext4 is not that universally usable as i.e. ext3.]