[linux-lvm] problem when creating a volumegroup on an external drive

Joep Blom jlblom at neuroweave.nl
Mon May 15 09:14:07 UTC 2006

Markus Laire wrote:

> On 5/15/06, Joep Blom <jlblom at neuroweave.nl> wrote:
>> Markus Laire wrote:
>> > pvcreate man-page says that:
>> > <quote>
>> > For *whole disk devices only* the partition table must be erased,
>> > which will effectively destroy all data on that disk. This can be done
>> > by zeroing the first sector with:
>> >  dd if=/dev/zero of=PhysicalVolume bs=512 count=1
>> > </quote>
>> >
>> Thanks, Marcus,
>> I have read that also but pvcreate (lvm2) worked nevertheless. I only
>> have the warning with fdisk that it encounters an "invalid flag 0x000 in
>> partition table 4 which will be corrected with write". So I simply don't
>> use fdisk on that disk and I don't know if this is harmful. But thanks
>> for reminding me.
> Well, since fdisk is "Partition table manipulator for Linux", you
> clearly shouldn't use it on disks which don't have a partition-table.
> And if you use whole disk for LVM, you don't have any partitions there
> (and shouldn't have partition-table either), and so fdisk is of no use
> for such a disk.
I agree.

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