QNAP NAS 509 (LINUX) - how to unmout busy volume and find physical disk?
- by Horst Walter
On my NAS QNAP TS 509 I do have a technical issue. I need to run e2fsck. This works fine for me on md0 (see below), but how can I unmount the busy devices md9 and sda4 in order to do the same. Whenever I try, I fail because the device is busy. [This part is solved, see below]
In order to further track down the issue, I'd need to sort out the physical disk to device relationship. How can I find out this, e.g. md0 is a stripped volume on 2 disk (but I need to find out on what physical disk).
Remark: As you can easily derive from my questions, I am not a Linux expert, but manage to get along.
/dev/ram0 124.0M 94.1M 29.8M 76% /
tmpfs 32.0M 80.0k 31.9M 0% /tmp
/dev/sda4 310.0M 103.9M 206.1M 34% /mnt/ext
/dev/md9 509.5M 39.2M 470.2M 8% /mnt/HDA_ROOT
/dev/md0 1.8T 1.4T 444.7G 76% /share/MD0_DATA
tmpfs 32.0M 0 32.0M 0% /.eaccelerator.tmp
-- Added --
QNAP seems to be based on Busybox. I do not find something like init / telinit / runlevel. At busybox docs it says that I need to run the below. But in /var/service sv is not available. I want to go to single user mode to unmount the devices.
# cd /var/service
# sv d *
# sv u getty*
-- Added, thanks A4L --
This QNAP Box runs a special flavor of Linux, so not all SOPs do apply. In my particular case I found a services.sh script, stopping all services. After that the drive could be unmounted.
The information passed by A4L is valid and worth reading it, maybe I'll profit from it next time. Links: http://unix.stackexchange.com/questions/19918/umount-device-is-busy and http://unix.stackexchange.com/questions/15024/umount-device-is-busy-why
So the unmount issue is solved, still looking for the best option to find the physical to volume mapping.
