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When modifying the partition table, fdisk usually returns the following error message:

WARNING: Re-reading the partition table failed with error 16: Device or resource busy.

The kernel still uses the old table. The new table will be used at the next reboot.

Is there any method to avoid the reboot?

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depending of the partion you modify maybe mount -a could do the trick – Kiwy Apr 1 '14 at 11:58
You forgot to accept the answer – Nils Apr 3 '14 at 15:02

There is a solution using partprobe from parted software. More information here: http://www.gnu.org/software/parted/

After using your fdisk command and having done your modifications, do a partprobe or partprobe /dev/sdx and it should inform the kernel of the change without reboot.

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Resolved and worked with 'partprobe' by using the command: # /sbin/partprobe – Charles nakhel Apr 1 '14 at 12:23

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