[CentOS] How to make fdisk recognize increased iSCSI LUN?

Ross S. W. Walker rwalker at medallion.com
Fri Nov 16 21:27:40 UTC 2007

Mindaugas wrote:
>   Hello,
>   How to explain to fdisk that /dev/sda size changed? I 
> increased LUN on storage, reloaded iscsi, did echo 1 > 
> /sys/<something>/rescan. And I see in "dmesg" that kernel 
> found new size of the LUN. But when I type "fdisk /dev/sda" 
> it still shows old size. On /dev/sda1 sits LVM PV and I'd 
> like to resize it instead of adding one more PV to volume group.

I think it may be the MBR that still has the old size in it.

Try opening it in fdisk, save it, then re-open it.


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