A couple hours ago PGE did it to me again. This happens every couple of
months. The lights flickered off, and then immediately came back on.
Now, I have three massive APC backup units that run everything, even
the stereo. I mean, all the network components, both computers, the
Lenovo dock and everything connected to it. And when the power failed
they all remained running, except the enclosure that holds four 8TB
NVMe drives in RAID0 to give me a 32TB mdadm device, known as md0p1. It
auto-mounts via a line in fstab.
Unfortunately, after the power glitch I cannot access anything on the
device. The GUI file managers (PCManFM, Thunar, etc.) displayed the
folders, but the contents were blank. I could open a text file in
mousepad, but I could not save it because it was read only. How this
happened is a mystery; before the power glitch it was mounted r/w, as
it always is.
After a couple hours of trying to fix the problem I have managed to
umount the device. However, attempting to remount it has failed:
sudo mount -a
mount: /media/jjj/Movies: /dev/md0p1 already mounted or mount point busy
<note: it was not mounted>
<the fstab line is:
UUID=09ed8807-e45a-4dac-8f4b-5ad9a07be90a /media/jjj/Movies auto
nosuid,nodev,nofail,x-gvfs-show,user 0 0)
sudo mount /dev/md0p1 /media/jjj/Movies
mount: /media/jjj/Movies: /dev/md0p1 already mounted or mount point busy
<note: it was not mounted>
I also tried lsof, hoping that it might tell me what was hanging things
up, but I couldn't understand the results:
sudo lsof /dev/md0p1
lsof: WARNING: can't stat() fuse.gvfsd-fuse file system
/run/user/1000/gvfs Output information may be incomplete.
lsof: WARNING: can't stat() fuse.portal file system /run/user/1000/doc
Output information may be incomplete
Final note: This is not the first time that this device has given me
grief. From past experience, if I reboot the computer it comes back
fine. At the moment I don't want to reboot. But if rebooting fixes the
problem, it makes me suspect mdadm.
Suggestions welcome!
