Dale wrote on 15/06/2021 16:21: > Ramon Fischer wrote: >> Hello Dale, >> >> this also happens to me sometimes and the culprit was an open process >> still accessing the hard drive. Maybe you can solve it like this: >> >> $ lsof /mnt/8tb >> zsh 8390 root cwd DIR 253,2 4096 27787265 /mnt/8tb >> $ kill 8390 >> $ lsof /mnt/8tb >> >> After that, you should be able to close the drive via "cryptsetup". >> >> -Ramon >> > > I've tried lsof before, for both mount point and device, it shows > nothing open. It's weird.
When this happens here, it's because I accessed the drive over NFS. The NFS server sometimes keeps mount points active, and they don't show up in the output of lsof probably because the NFS server is in-kernel, so there are no processes associated with it. Restarting the NFS server allows unmounting. -- Remy
