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List:       fedora-list
Subject:    Re: Authentication is required to mount /dev/fedora_localhost-live/home
From:       Patrick O'Callaghan <pocallaghan () gmail ! com>
Date:       2020-02-03 22:56:59
Message-ID: 5f02759401deb7203569b08847d8fdc0a8d457ec.camel () gmail ! com
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On Mon, 2020-02-03 at 12:17 -0800, Mike Wright wrote:
> Some quick notes about lvm.  The essence of LVM is the volume group 
> (VG).  Volume groups contain logical volumes (LV).  Volume groups are 
> defined by specifying the raw devices, the physical volumes (PV), that 
> provide the storage.  In order to attach a PV to a VG the raw device 
> /dev/sdX must be tagged as a PV.  Until that is done (pvcreate) a raw 
> device cannot be part of a VG.  Once within a VG the raw device isn't 
> really mountable because the filesystem on it is created at the LV 
> level, not the raw device level.

Yes, I already understand that much in theory.

> Now as to sd5: try the command "pvs".  It will show the tagged (defined) 
> PVs AND it will show which, if any, VGs that they belong to.

$ sudo pvs
  PV         VG                    Fmt  Attr PSize    PFree  
  /dev/sda3  fedora_localhost-live lvm2 a--  <128.00g <17.80g
  /dev/sda4  fedora_localhost-live lvm2 a--   <16.00g <16.00g
$

> If sda5 is NOT listed by "pvs" then your mount environment is mixed 
> raw/LVM.

That appears to be the case.

> Any way you look at it, you may mount both the raw device and 
> the LV at the same point but only the most recent will be visible.  I 
> also have a hunch that mounting a raw device that is part of a VG is an 
> invitation to disaster.

It wouldn't surprise me. How can I unravel this (short of a complete
reinstallation)? I'm not enamoured of LVM and would be quite happy to
revert to basic partitioning, but if that isn't feasible I'm willing to
move forward to LVM-only if that's what it takes.

Thanks.

poc
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