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 05:01:46PM +0200, Robin Edgar - Tripany wrote:
> Due to the dd the 2 disks should be identical - how do i get the VG to
> activate the PV of choice? I can't figure out how to deactivate hdb1 and
> activate hde1 or how vgchange decides it wants to use hdb1 instead of hde1!

Zero the first block of hdb1 (dd if=/dev/zero of=/dev/hdb1 bs=1k count=1) or
create a new physical volume on /dev/hdb1 (pvcreate -ff /dev/hdb1).

Regards,
Heinz    -- The LVM Guy --

> 
> Robin
> 
> > 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 ***
> >
> > _______________________________________________
> > 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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