On Mon, 20 Jun 2011 18:48:40 +0100 Simon McNair <simonmcnair@xxxxxxxxx> wrote: > I wanted to run 'mkfs.ext4 -n /dev/md0' to see what settings it would > choose that were different to mine but it keeps saying: > "/dev/md0 is apparently in use by the system; will not make a filesystem > here!". > > I also can't stop the array using 'mdadm --stop /dev/md0' as it says > mdadm: failed to stop array /dev/md0: Device or resource busy. pretty > much the same error occurs when trying lvchange -an /media/local/Raid > > I've no problem with any of this except I can't find out what process > has a handle on the mount and/or why. so I can't stop/kill it. > > I tried lsof | grep /media/local/Raid and fuser -m /media/local/Raid to > no avail. I also tried ps aux | grep Raid. I've stopped pretty much > everything in init.d including samba,nfs,mediatomb,squeezebox and > anything I can think of that I've installed. > > Any advice/ideas please ? I don't see you mention actually running "umount /media/local/Raid" (and perhaps listing the error messages you get after that). Perhaps it goes without saying and you did this, but in case not, remember that "mdadm --stop" will not try to auto-unmount the filesystem for you first. Other ideas, AFAIK lsof and fuser won't show you a process that holds the filesystem mounted in case it doesn't have any files open there, but instead just has its *current directory* on the FS. So if you launched something while cd'ed somewhere in /media/local/Raid, and it's still running (maybe the superuser shell you currently work in?), that'd be your reason. - With respect, Roman
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