There are other questions like this bumbling around the site (that I'm working through) but I'm in the strange position where I think I know what I'm doing but can't explain what's going on.
- I had 10x ~10GB files. None of them were open. Previews in Dolphin are turned off for files that big. Confirmed with
- I selected the files and pressed Shift+Delete. This should skip the trash and nuke the files.
- No progress was recorded. Usually Dolphin/KDE make a big fuss about deleting things.
- The files are "gone" (not showing in Dolphin or the command line)
- I'm still 100GB heavier than I should be. Most importantly, I'm at 100% disk use, which is why this is an urgent issue.
- I've checked .trash on that drive and they weren't in there.
- I've checked
lsofagain. They're not open.
So it seems like the inodes were deleted but the space wasn't freed. I would assume I have 100GB of orphan files. Hooray.
Is there any way I can purge these orphan files from an active filesystem (I realise a fsck would probably shift them off an offline filesystem)? I can't take the filesystem offline because important things (system files, home items, etc) are bind-mounted out of here.
Other details: the filesystem is EXT3 (I know, I should probably upgrade but changing FS is scaring when you're dealing with 4TB of data). The device is a mdadm RAID5 array.