Re: [linux-lvm] Re: brainfart: lilo'd a PV

From: Ray Morris <support@bettercgi.com>
To: LVM general discussion and development <linux-lvm@redhat.com>
Subject: Re: [linux-lvm] Re: brainfart: lilo'd a PV
Date: Thu, 17 Dec 2009 21:31:58 -0600	[thread overview]
Message-ID: <1261107118.11465.16@raydesk1.bettercgi.com> (raw)
In-Reply-To: <1261101785.21162.712.camel@pc.interlinx.bc.ca> (from brian@interlinx.bc.ca on Thu Dec 17 20:03:08 2009)

> > Yes. The area begin with "LABELONE" is PV label,
> 
> Looks like the LVM developers foresaw my brainfart and left the first
> sector of the disk for me to bugger up without buggering up LVM.  :-)


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On 12/17/2009 08:03:08 PM, Brian J. Murrell wrote:
> On Thu, 2009-12-17 at 19:48 -0500, Takahiro Yasui wrote:
> >
> > Yes. The area begin with "LABELONE" is PV label,
> 
> Looks like the LVM developers foresaw my brainfart and left the first
> sector of the disk for me to bugger up without buggering up LVM.  :-)
> 
> > which is recorded in
> > the first sector by default.
> 
> Hrm.  Do you really mean "first" there or second, which is sector 1 if
> you start counting with 0?
> 
> > This is the description from the pvcreate
> > man page.
> >
> >        --labelsector sector
> >               By default the PV is labelled with an  LVM2   
> identifier  in  its
> >               second  sector (sector 1).
> 
> Yes, this looks so.
> 
> >   This lets you use a different sector
> >               near the start of the disk (between 0  and  3   
> inclusive  -  see
> >               LABEL_SCAN_SECTORS in the source).  Use with care.
> 
> > You don't have any problem on the PV, do you?
> 
> I don't think I do:
> 
> # pvdisplay /dev/sda
>   --- Physical volume ---
>   PV Name               /dev/sda
>   VG Name               datavol
>   PV Size               931.51 GB / not usable 1.71 MB
>   Allocatable           yes
>   PE Size (KByte)       4096
>   Total PE              238467
>   Free PE               85356
>   Allocated PE          153111
>   PV UUID               C22uVB-4m26-5cvl-I11V-NXCm-mVNo-UTAXUH
> 
> But of course, I just want to get the opinion of the experts.
> 
> > I don't think you need something to repair the PV.
> 
> I don't think so either, but of course, do want to confirm my  
> suspicion.
> 
> Thanx much for your insight.
> 
> b.
> 
> 

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