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

From: Ming Zhang <mingz@ele.uri.edu>
To: Joep Blom <jlblom@neuroweave.nl>
Cc: LVM general discussion and development <linux-lvm@redhat.com>
Subject: Re: [linux-lvm] problem when creating a volumegroup on an external drive
Date: Sat, 13 May 2006 11:42:49 -0400	[thread overview]
Message-ID: <1147534970.9185.30.camel@localhost.localdomain> (raw)
In-Reply-To: <4465967E.6090206@neuroweave.nl>

i did not follow the whole thread and thus i have no idea.

if there is no important data on it and it now does not belong to any
vg. u can use dd to wipe the first 512B and then do pvcreate as u want.

ming

On Sat, 2006-05-13 at 10:19 +0200, Joep Blom wrote:
> Ming Zhang wrote:
> 
> >On Sat, 2006-05-13 at 00:25 +0200, Joep Blom wrote:
> >  
> >
> >>Klaus Strebel wrote:
> >>
> >>    
> >>
> >>>Hi Joep,
> >>>
> >>>well, what Patrick meant is, that your system (forget that USB drive in
> >>>this moment) already has a VG called VolGroup00 on your internal disk.
> >>>The modern FC distros use it as default (i think, i'm using SuSE ;-) ).
> >>>Before messing up more using fdisk, just provide us with the output of a
> >>>vgdisplay -a ;-) get an impression of the 'disaster' :-).
> >>>
> >>>Btw. the volume group your wanted to create has the name VG0, not
> >>>VolGroup00 ;-) ..
> >>>
> >>>Ciao
> >>>Klaus
> >>>
> >>> 
> >>>
> >>>      
> >>>
> >>Klaus & Pattrick,
> >>I'm sorry I asked the wrong question (stupid me!). I interpreted the 
> >>output of vgcreate wrongly. Yes, Klaus, the VolGroup00 was automatically 
> >>created by FC when I did an upgrade.
> >>The correct question is that VG01 (the name I gave it) occupies 232.88 
> >>Gb although I had asked for 250 Gb. Where are the 17.2 GB and can I add 
> >>    
> >>
> >
> >
> >when u buy the disk, vendor count it as 250GB or 250 * 1000 * 1000 *
> >1000 bytes.
> >
> >when LVM count it, it is 250 * 1000 * 1000 * 1000 / 1024 / 1024/ 1024 =
> >232.83GB.
> >
> >check online, many discussion about this 1024 and 1000 issue.
> >
> >
> >  
> >
> >>them to VG01.
> >>When I look with fdisk it says that no information is available for 
> >>/dev/sda1 and "invalid flag 0x0000 of partition table 4 will be 
> >>corrected by w(rite)".
> >>I assume that all problems have arisen due to the fact that I did a 
> >>pvcreate on a disk which has a W95 FAT32 partition ( of 250 Gb).
> >>I assume the best way is to delete the partition completely and create a 
> >>new partition (with parted or fdisk?) or are there better methods? Do I 
> >>have to remove VG01 first?
> >>Please, be lenient to me for these basic questions.
> >>Joep
> >>
> >>
> >>_______________________________________________
> >>linux-lvm mailing list
> >>linux-lvm@redhat.com
> >>https://www.redhat.com/mailman/listinfo/linux-lvm
> >>read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
> >>    
> >>
> >
> >_______________________________________________
> >linux-lvm mailing list
> >linux-lvm@redhat.com
> >https://www.redhat.com/mailman/listinfo/linux-lvm
> >read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
> >
> >  
> >
> Ah, Ming,
> Thanks! That solves it!.
> So I don't have to remove the already created pv. Only fdisk complains 
> because when I do an "fdisk /dev/sda" it sees it still as a FAT32 
> partition but when I do an "fdisk /dev/sda1" it correctly sees it as a 
> partition which is virtually free but with the invalid flag in partition 
> table 4. As I use it as a backup disk I don't have to boot from it but 
> is a logical volume bootable?
> One last question: Why can't  I use "pvcreate /dev/sda" but have to use 
> "pvcreate /dev/sda1" (as the LV HOW-TO stated the former).
> Hope you can help me out with this as well.
> Joep
> 