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Date: Wed, 02 Nov 2011 16:39:11 +0000
From: James Hawtin <oolon@ankh.org>
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Subject: Re: [linux-lvm] N00b Question: Logical Volume without
 a	Logical	Volume Group ?
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To: LVM general discussion and development <linux-lvm@redhat.com>

Dan White wrote:
>
> I just experienced that.
>
> I had to reboot the machine to "see" the expanded LUN.
> I used fdisk to make a partition out of the LUN expansion, but I had to reboot again before I could do anything further.
> After the second reboot, I was able to make a PV out of the new partition, roll it into the existing VG and then expand the two test LV's I had previously created to utilize the new elbow room.
>
> This is on a RHEL 5.7 system.
>
> Is there a way to do this without the rebooting ?
>
>   
Assuming the device is sda then

|echo 1 > /sys/block/sda/device/rescan|

However if that fails (and it can) only a reboot or removing the disk 
driver module and reinstalling it will scan it correctly (possible if 
you have a mix of local and san disk) however probably a reboot is easiler.

James