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Re: Trouble LVM: pvcreate to usb disk managed by udev

>>>>> "Andy" == Andy Hawkins
>>>>> "Re: Trouble LVM: pvcreate to usb disk managed by udev"
>>>>>  Wed, 4 Jan 2006 22:06:56 +0000 (UTC)

    Andy> Hi, In article <[🔎] 87r77nk7nn.fsf@athene.jamux.com>,
    Andy>            John A. Martin<jam@jamux.com> wrote:
    >> As root:
    >> ,----[ pvcreate /dev/sdc ]
    >>   Device /dev/sdc not found.
    >> `----

    Andy> Doesn't this need to be done on a partition, rather than the
    Andy> disk itself?

,----[ Excerpt: man PVCREATE ]
       pvcreate initializes PhysicalVolume for later use by the
       Logical Volume Manager (LVM).  Each PhysicalVolume can be a
       disk partition, whole disk, meta device, or loopback file.

,----[ Excerpt: LVM-HOWTO ]
11.1. Initializing disks or disk partitions

  Before you can use a disk or disk partition as a physical volume you
will have to initialize it:

  For entire disks:

  *   Run pvcreate on the disk:
    # pvcreate /dev/hdb                                                      
    This creates a volume group descriptor at the start of disk.
  *   If you get an error that LVM can't initialize a disk with a partition
    table on it, first make sure that the disk you are operating on is the
    correct one. If you are very sure that it is, run the following:
    Warning DANGEROUS                                                        
            The following commands will destroy the partition table on the   
            disk being operated on. Be very sure it is the correct disk.     
    # dd if=/dev/zero of=/dev/diskname bs=1k count=1                         
    # blockdev --rereadpt /dev/diskname                                      

Maybe I misunderstand the above?  I'm sure I misunderstand something!


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