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SimonJGreen
Asked: 2015-03-25 14:27:44 +0800 CST

Ubuntu remount a root mount that's changed to ro as rw without rebooting

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Because of errors=remount-ro an underlying NFS blip caused my root mount to be remounted as read-only. I know there is nothing wrong I need to worry about. How can I remount this as rw without rebooting the server?

Some tests:

simon@steve:~$ sudo hdparm -r /dev/sda1

/dev/sda1:
 readonly      =  0 (off)
simon@steve:~$ sudo blockdev --setrw /dev/sda1
simon@steve:~$ sudo blockdev --setrw /dev/sda
simon@steve:~$ sudo hdparm -r /dev/sda1

/dev/sda1:
 readonly      =  0 (off)
simon@steve:~$ sudo hdparm -r /dev/sda

/dev/sda:
 readonly      =  0 (off)
simon@steve:~$ sudo mount -o remount,rw /
mount: cannot remount block device /dev/sda1 read-write, is write-protected
linux

1 Answers

  1. mount -o remount,rw /mountpoint
    • 3