how to umount /

taiwf · 08-03-2005, 07:07 PM

i accidently mount a remote drive onto / which is mount by dev/sda locally as well. I try to umount the remote drive but then got 3 lines of device busy.

Is there anyway to umount WITHOUT restart linux server?

ps: the remote drive is in NT machine

thanks in advance.

Brian1 · 08-03-2005, 07:22 PM

You have a few options for umount. Try the -l ( Thats a lower case L ) for lazy umount and -f for force. See what happens

Brian1

trickykid · 08-03-2005, 07:34 PM

umount the actual share name, not where you mounted it to..

If you try to run 'umount /' it's going to give you the resource busy each and every time.

taiwf · 08-04-2005, 12:38 AM

the NT drive mounted onto / is backups. I try to umount //file-share/backups and it said

umount: //file-share/backups: not found
umount: /: not mounted
umount: /dev/sda1: not mounted
umount: //file-share/backups: not found
umount: /: not mounted

trickykid · 08-04-2005, 10:07 AM

Quote:

Originally posted by taiwf
the NT drive mounted onto / is backups. I try to umount //file-share/backups and it said

umount: //file-share/backups: not found
umount: /: not mounted
umount: /dev/sda1: not mounted
umount: //file-share/backups: not found
umount: /: not mounted

What is the output of mount?

eantoranz · 08-04-2005, 12:18 PM

I think you should print the output of

Code:

mount

trickykid · 08-04-2005, 12:24 PM

Quote:

Originally posted by eantoranz
I think you should print the output of

Code:

mount

I asked the same thing about two hours prior, didn't you read my last post?

eantoranz · 08-04-2005, 12:29 PM

You're righ. Let's wait for the little grass-hopper to wake up! ;-)

taiwf · 08-04-2005, 09:32 PM

the output of mount is

/dev/sda1 81G 71G 5.9G 93% /
tmpfs 441M 0 441M 0% /dev/shm
/dev/sdb1 xxxxx xxxxx
//file-share/backups xxx xxxx xxx /

the tmpfs drive not so sure .. coz i just reboot today coz sth bad happen... But i still like to know the proper umount way...

eantoranz · 08-04-2005, 10:36 PM

I don't find any sense in that mount output. I'm gonna use mine as an example:

Code:

/dev/ide/host0/bus0/target0/lun0/part1 on / type ext3 (rw,noatime)
none on /proc type proc (rw)
none on /proc/bus/usb type usbdevfs (rw)
none on /dev type devfs (rw)
none on /sys type sysfs (rw)
none on /dev/pts type devpts (rw,mode=0620)
/dev/ide/host0/bus0/target0/lun0/part8 on /home type ext3 (rw,noatime)
/dev/ide/host0/bus0/target0/lun0/part9 on /mnt/datos type vfat (rw,uid=501,umask=0022,iocharset=iso8859-1,codepage=850)
/dev/ide/host0/bus0/target0/lun0/part3 on /mnt/xp type vfat (rw,umask=0)
none on /tmp type tmpfs (rw)
/dev/ide/host0/bus0/target0/lun0/part6 on /usr type ext3 (rw,noatime)
/dev/ide/host0/bus0/target0/lun0/part7 on /var type ext3 (rw,noatime)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)

You see? it tells you the device and the mount point.

If you wan't to unmount /var, then:

umount /var

eantoranz · 08-04-2005, 10:40 PM

But there's a problem. How are you gonna unmount the ROOT directory? I don't think that's possible, man.

logosys · 08-04-2005, 11:16 PM

Quote:

Originally posted by eantoranz
But there's a problem. How are you gonna unmount the ROOT directory? I don't think that's possible, man.

can you chroot to your new / directory, then unmount the device?

taiwf · 08-05-2005, 12:51 AM

sorry i misunderstand... the lines about mount above was actually ones after i type df -h

the actual on look something similiar to this..

/dev/hda1 on / type ext2 (rw,errors=remount-ro)
proc on /proc type proc (rw)
//file-share/backups on / type smbfs (rw)

taiwf · 08-05-2005, 01:40 AM

ok chroot really doesn't help...

mkdir -p /candy
cp -av /bin /dev /etc /home /lib /root /sbin /tmp /usr /var
chroot /candy su -

---------------------------------------

debian-dav://# umount /
umount: //file-share/backups: not found
umount: /: not mounted
umount: /dev/hda1: not mounted
debian-dav://# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/hda1 3.3G 1.3G 1.9G 41% /
df: `/proc': No such file or directory
//file-share/backups 3.3G 1.3G 1.9G 41% /

----------------------------------------

the disk still mounted on / . And the problem back to the origial point

And new issue, how the hell do i get back to the original root? (without reboot, or does reboot even help??)