Can't umount HDD on NextcloudPi

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1

Heya,

I am trying to configure a second harddrive as a backup drive. In order to do that I need to disconnect my data drive first. I don’t want to simply unplug it as it can be seen in various tutorials, so I tried umount /dev/sda1 via SSH with no luck: Error finding object for block device 0:41

Here is the output of lsblk:

pi@nextcloudpi:~ $ lsblk
NAME        MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda           8:0    0  4.6T  0 disk 
`-sda1        8:1    0  4.6T  0 part /media/myCloudDrive
mmcblk0     179:0    0 59.5G  0 disk 
|-mmcblk0p1 179:1    0  256M  0 part /boot
`-mmcblk0p2 179:2    0 59.2G  0 part /

Did I do anything wrong regarding syntax? If I try umount /dev/sda I get the following message:
umount: /dev/sda: not mounted.
I guess umount only unmounts partitions and not drives, right?

NextCloudPi v1.43.5
NextCloud version 21.0.4.1

2

Might be wrong, but… do you have enough external power for multiple disks? Just making sure you have a powered USB hub or both disks have their own isolated power.

Power issues can be a problem if the power supply for the Pi is also being used for the disks. :+1:

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3

Thanks for taking it into account. Yes, I just got a powered USB hub which works fine. I remember having the same problem without the hub, anyway.

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4

If you want to unmount sda, don’t you need to unmount /media/myCloudDrive?

your lsblk tells me that /dev/sda1 is mounted to /media/myCloudDrive

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5

I tried that, but unfortunately get this error message:

Error finding object for block device 0:41

6

no worries…

Just put NCP in Maintenance mode and unplug… :grin: That way, you can be sure nothing is being written to it while you pull the plug.

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7

Thanks, that is so much easier! Very much appreciated.

8

You need to sudo umount /dev/sda1. If that doesn’t work you should power off the device, rather than unplugging even if you are on maintenance mode

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9

Thanks @nachoparker, I get the same error message when I try sda1: Error finding object for block device 0:41
Any idea why I am not able to unmount the drive? I did remove it in maintenance mode now anyway… Fingers crossed that it went without harm to any files. Next time I am going to shut down first.