Re: [linux-lvm] Help! unable to mount lv's - can't see why!

["Heinz J . Mauelshagen" <mauelshagen@sistina.com>]

On Thu, Sep 19, 2002 at 12:45:47PM +0200, Robin Edgar - Tripany wrote:
> Fair enough, but I would very much like to access the files and determine
> later what has errors and what doesn't - at the moment, I can only do this
> with the docu lv and none of the others...
> 
> You were right, I did manage to get a whole load of lost+found entries using
> fsck after the mount. The docu entry was on the physical extent though, and
> seems to be working fine.
> Anyway I thought I'd upgrade LVM to 1.0.5 from 1.0.1 and refit the disks to
> the 'old' configuration (4 disks + 1 for backup), to do a pvmove.
> Now when I do a pvscan, it finds all the disks, but also the disk I did the
> dd to, as part of the vg. So I de-activated the vg, and tried to reduce the
> vg /dev/hdb1, hoiwever this is not working:
> 
> # vgreduce tripserv_vol /dev/hdb1
> vgreduce -- ERROR: can't reduce volume group "tripserv_vol" by used physical
> volume "/dev/hdb1"

Well, LVM  still has allocated extents on that PV. You can just remove
empty PVs from a VG.

> 
> # pvscan -v
> pvscan -- reading all physical volumes (this may take a while...)
> pvscan -- walking through all physical volumes found
> pvscan -- ACTIVE   PV "/dev/hdg1" of VG "tripserv_vol" [38.16 GB / 7.93 GB
> free]
> pvscan -- ACTIVE   PV "/dev/hdh1" of VG "tripserv_vol" [38.16 GB / 8.01 GB
> free]
> pvscan -- inactive PV "/dev/hde1" of VG "tripserv_vol" [55.91 GB / 0 free]
> pvscan -- ACTIVE   PV "/dev/hdf1" of VG "tripserv_vol" [55.91 GB / 3.37 GB
> free]
> pvscan -- ACTIVE   PV "/dev/hdb1" of VG "tripserv_vol" [55.91 GB / 0 free]
> pvscan -- total: 5 [244.08 GB] / in use: 5 [244.08 GB] / in no VG: 0 [0]
> 
> If i vgchange -a n it will deactivate them all, but then I get:
> # vgreduce tripserv_vol /dev/hdb1
> vgreduce -- ERROR: volume group "tripserv_vol" is not active

Doesn't change the situation, because the PV still has extents allocated.
A PV must be empty and the VG active in order to remove it from the VG.

> 
> After I restore the vg to it's 'old' configuration, I want to empty
> /dev/hdb1 and add it to the volume group. Then doing a pvmove -i /dev/hde1
> should move all the data it can find there to the rest of the vg shouldn't
> it?

Yes, presuming that you've got enought space to fit all extents allocated
to /dev/hde1.

> 
> Thank you for all your help so far,

You're welcome.

Regards,
Heinz    -- The LVM Guy --

> Robin Edgar
> 
> ----- Original Message -----
> From: "Heinz J . Mauelshagen" <mauelshagen@sistina.com>
> To: <linux-lvm@sistina.com>
> Sent: Thursday, September 19, 2002 12:04 PM
> Subject: Re: [linux-lvm] Help! unable to mount lv's - can't see why!
> 
> 
> > On Wed, Sep 18, 2002 at 04:42:54PM +0200, Robin Edgar - Tripany wrote:
> > > Doing the lvdisplay -v shows that pv /dev/hde1 had bits of all of the
> lv's
> > > on it (including the docu lv, which I *can* mount).
> >
> > Then it is most likely, that all filesystems will have errors.
> >
> > Regards,
> > Heinz    -- The LVM Guy --
> >
> >
> > >
> > > ----- Original Message -----
> > > From: "Heinz J . Mauelshagen" <mauelshagen@sistina.com>
> > > To: <linux-lvm@sistina.com>
> > > Sent: Wednesday, September 18, 2002 3:59 PM
> > > Subject: Re: [linux-lvm] Help! unable to mount lv's - can't see why!
> > >
> > >
> > > > On Wed, Sep 18, 2002 at 03:56:36PM +0200, Robin Edgar - Tripany wrote:
> > > > > I've discovered that there is a problem with /all/ the superblocks
> > > except for those of the /docu lv (see below). It does lead me to another
> > > question though - only one of the HDs crashed: is it possible that LVM
> wrote
> > > all the superblocks on 1 HD?! If so this seems like a pretty serious bug
> in
> > <SNIP>
> > > > linux-lvm mailing list
> > > > linux-lvm@sistina.com
> > > > http://lists.sistina.com/mailman/listinfo/linux-lvm
> > > > read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html
> > > >
> > > >
> > >
> > >
> > >
> > > _______________________________________________
> > > linux-lvm mailing list
> > > linux-lvm@sistina.com
> > > http://lists.sistina.com/mailman/listinfo/linux-lvm
> > > read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html
> >
> > *** Software bugs are stupid.
> >     Nevertheless it needs not so stupid people to solve them ***
> >
> >
> > _______________________________________________
> > linux-lvm mailing list
> > linux-lvm@sistina.com
> > http://lists.sistina.com/mailman/listinfo/linux-lvm
> > read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html
> >
> >
> 
> 
> 
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@sistina.com
> http://lists.sistina.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html

*** 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@Sistina.com                           +49 2626 141200
                                                       FAX 924446
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