[linux-lvm] pvcreate problem

Heinz J . Mauelshagen mauelshagen at sistina.com
Fri Dec 6 08:59:02 UTC 2002

On Thu, Dec 05, 2002 at 05:27:01PM -0600, Alexander Lazarevich wrote:
> i just installed a fresh RH linux 7.3, with LVM 1, or whatever comes in
> the RH distribution.
> ihe first thing i'm trying to do is pvcreate on my big RAID 5 array, which
> is /dev/sdb:
> [root at discord root]# pvcreate /dev/sdb
> pvcreate -- ERROR: can't initialize physical volume "/dev/sdb" of volume
> group "homevg" without -ff
> but there is no volume group homevg:
> [root at discord root]# vgdisplay homevg
> vgdisplay -- volume group "homevg" not found
> i am able to fdisk a partition onto /dev/sdb, and then do a pvcreate on
> that partition, but i want to do a pvcreate on the whole free volume, no
> partitions! i may have made a typo before, by trying to do a pvcreate
> /dev/sdb, i instead did a vgcreate /dev/sdb. and them i might have tried
> some other crap cause it was freeking out. i rebooted so i can see the
> history, unless lvm keeps some kind of log file? i couldnt find one.

No log file ITR.
In general having at least one partition per device is a good idea, because
sources like /proc/partitions or tools like fdisk find that there's something
on the device. You loose _very_ little capacity that way.

If you still want to use /dev/sdv directly "pvcreate -ff /dev/sdb;vgcreate ..."
should do it after you remove any partition table from /dev/sdb again.
Eventually you need a "dd if=/dev/zero of=/dev/sdb bs=512 count=1" _after_
you removed the partition table.

> i rebooted, etc. id prefer not to have to reinstall everything. how do i
> fix this problem?
> any ideas?
> thanks in advance!
> alex
> ---                                                        ---
>    Alex Lazarevich | Systems | Imaging Technology Group
>    alazarev at itg.uiuc.edu | (217)244-1565 | www.itg.uiuc.edu
> ---                                                        ---
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Heinz    -- The LVM Guy --

*** Software bugs are stupid.
    Nevertheless it needs not so stupid people to solve them ***


Heinz Mauelshagen                                 Sistina Software Inc.
Senior Consultant/Developer                       Am Sonnenhang 11
                                                  56242 Marienrachdorf
Mauelshagen at Sistina.com                           +49 2626 141200
                                                       FAX 924446

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