[linux-lvm] Changing device numbers.

[Heinz J. Mauelshagen]

On Wed, Mar 14, 2001 at 08:11:44PM -0800, Bas wrote:
> ----- Original Message -----
> From: Heinz J. Mauelshagen <Mauelshagen at sistina.com>
> To: <linux-lvm at sistina.com>
> Sent: woensdag 14 maart 2001 8:37
> Subject: Re: [linux-lvm] Changing device numbers.
> 
> 
> > On Tue, Mar 13, 2001 at 02:37:06PM -0700, Andreas Dilger wrote:
> > > Bas writes:
> > > > Rerunning lilo seemed to work, but I had the same problem just a while
> ago
> > > > without changing anything but adding a LV.
> > >
> > > Maybe because you are running "vgscan" on each boot?  It is not really
> > > needed by LVM unless the disk configuration changes.  When you run it,
> > > there is the possibility of the VG and LV devices changing major
> numbers.
> > >
> > > Even so, it is a problem (IMHO) that LVM likes to delete all of the
> > > device files each time vgscan is run.  The correct thing to do would
> > > be to have "pvscan" create a file of UUID->disk mappings on each boot,
> > > and leave the LVM devices alone.  Then vgscan would only be needed if
> > > there is a major disaster.
> >
> > Andreas, we are planning for something very similar to this, because we
> need
> > it for Cluster-LVM anyway: the driver will do the scanning and keep
> > the mapping list which can be requested by the tools later.
> >
> 
> That looks good. How are minor numbers assigned now ? By LE (1st LE means
> device number 58,0) ?

s/LE/LV/ -> yes.

1st LV in 1st VG -> 58,0
2nd LV in 1st VG -> 58,1
1st LV in 2nd VG -> 58,2

and so on.

If you run vgscan while VGs are active, the active ones come first and
the inactive ones in a row after those.

> 
> 
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-- 

Regards,
Heinz    -- The LVM Guy --

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

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