[linux-lvm] Unable to create a physical volume on a whole disk

[linux-lvm] Unable to create a physical volume on a whole disk

[Jan H. van Gils]

	Hi,

Thanks for reading this message.

The following is the case, I would like to create a pv on a whole disk
but pvcreate gives me the message that there is a "partition table" on
the
disk.

I removed the partition table with "dd if=/dev/zero of=/dev/hdb bs=512
count=1"
The fdisk command shows me that there is no partion table but pvcreate
tells me
different.

Here is some info :

Disk Info
gw:/dev# dmesg | grep hdb
    ide0: BM-DMA at 0xe000-0xe007, BIOS settings: hda:DMA, hdb:DMA
hdb: ST310212A, ATA DISK drive
hdb: 20005650 sectors (10243 MB) w/512KiB Cache, CHS=19846/16/63,
UDMA(33)

Fdisk Info :

gw:/dev# fdisk -l /dev/hdb

Disk /dev/hdb: 10.2 GB, 10242892800 bytes
16 heads, 63 sectors/track, 19846 cylinders
Units = cylinders of 1008 * 512 = 516096 bytes
Disk /dev/hdb doesn't contain a valid partition table

Pvcreate Info :

gw:/dev# pvcreate --version
pvcreate: Logical Volume Manager 1.0.4
Heinz Mauelshagen, Sistina Software  02/05/2002 (IOP 10)

gw:/dev# pvcreate /dev/hdb

pvcreate -- device "/dev/hdb" has a partition table

Has anybody an idea on howto solve this problem.
I already rebooted the system to be sure the partition table is active.

Greetz Jan

----
With regards Jan H. van Gils
Internet web-page http://www.vgnet.nl/
Internet e-mail address JanVG@Knoware.NL
RIPE Whois JHG5-RIPE, 6BONE Whois JHG1-6BONE

Re: [linux-lvm] Unable to create a physical volume on a whole disk

[Luca Berra]

Jan H. van Gils wrote:
> 	Hi,
> 
> Thanks for reading this message.
> 
> The following is the case, I would like to create a pv on a whole disk
> but pvcreate gives me the message that there is a "partition table" on
> the
> disk.
> 
> I removed the partition table with "dd if=/dev/zero of=/dev/hdb bs=512
> count=1"
> The fdisk command shows me that there is no partion table but pvcreate
> tells me
> different.

check if kernel has seen a partition during boot (cat /proc/partition)
in this case you either have to issue

blockdev --rereadpt /dev/hdb
or reboot

L.
-- 
Luca Berra -- bluca@comedia.it
  /"\
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   X        AGAINST HTML MAIL
  / \

RE: [linux-lvm] Unable to create a physical volume on a whole disk

[Jan H. van Gils]

>Jan H. van Gils wrote:
>> 	Hi,
>> 
>> Thanks for reading this message.
>> 
>> The following is the case, I would like to create a pv on a 
>whole disk 
>> but pvcreate gives me the message that there is a "partition 
>table" on 
>> the disk.
>> 
>> I removed the partition table with "dd if=/dev/zero 
>of=/dev/hdb bs=512 
>> count=1" The fdisk command shows me that there is no partion 
>table but 
>> pvcreate tells me
>> different.
>

Luca Berra wrote :

>check if kernel has seen a partition during boot (cat 
>/proc/partition) in this case you either have to issue
>
>blockdev --rereadpt /dev/hdb
>or reboot

Luca, I alleady tried a reboot and that didn't solve the problem.

Any other suggestions ?


Jan

----
With regards Jan H. van Gils
Internet web-page http://www.Knoware.NL/users/janvg/
Internet e-mail address JanVG@Knoware.NL
RIPE Whois JHG5-RIPE, 6BONE Whois JHG1-6BONE

Re: [linux-lvm] Unable to create a physical volume on a whole disk

[George Karaolides]

Hi Jan,

> I would like to create a pv on a whole disk but pvcreate gives me the
> message that there is a "partition table" on the disk.

> gw:/dev# pvcreate /dev/hdb
> pvcreate -- device "/dev/hdb" has a partition table

I think what teh message from pvcreate means is that this is a device
with a partition table, and pvceate isn't supposed to be used on such
devices with partition tables, but only on partition-like devices.  I
think pvcreate doesn't care whether the partition table is valid or not;
it only cares about the type of device.

I would suggest that, to use the space on a whole disk as a physical
volume, you try:

- Making just one partition of the whole disk space, with fdisk or other
partitioning tool of your choice; that will normally be /dev/hdb1
- Making a physical volume in that: pvcreate /dev/hdb1

-- 
Best regards,

|   George Karaolides                      Planitis Communications Ltd.,
|
|   tel:   +357 22 45 65 00              Office 102, 11 Florinis Street,
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|   web:   www.planitis.net                             Nicosia CY 1065,
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