[linux-lvm] N00b Question: Logical Volume without a Logical Volume Group ?

Eugene Vilensky evilensky at gmail.com
Wed Nov 2 17:30:26 UTC 2011

On Wed, Nov 2, 2011 at 11:39 AM, James Hawtin <oolon at ankh.org> wrote:

> 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.

Not sure if this sort of thing matters to everyone, but I was informed by
Support that despite methods that may be available at hand, a reboot is the
only "Supported" method of recognizing changed partition information on a
disk that is in use.  -1.
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