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Chris Laycock/UK/IBM IBMGB
cc: LVM general discussion and development <linux-lvm redhat com>, mauelshagen redhat com
Subject: Re: [linux-lvm] It never rains...
On Mon, Mar 22, 2004 at 04:20:42PM +0000, Chris Laycock wrote:
> Heinz, et al
> Sorry I failed to explain clearly what has happened. I have in fact lost 2
> disks. 1 disk contained to /boot, / and the swap space, the other disk I
> lost was from a 3 disk LVM called datavg.
> I have rebuilt the system on a new disk but I have lost /etc/lvmconf,
> therefore (I assume) I have no metadata to restore the VG from.
Unless you have actual backups of /etc/lvmconf somewhere, I'm afraid so.
> Unfortunately I don't have access to the system until later tonight to
> test if you did in fact understand my poor explanation!
If you really don't have actual LVM metadata backups:
in order to get to the other 2 PVs out of 3 in your VG, you want to use LVM2
and device-mapper and run "vgscan --partial".
Heinz -- The LVM Guy --
> Many thanks,
> Chris Laycock
> IT Specialist
> IBM Global Services (IDO)
> LITS, Stevenage
> Mail point: K3 STEV UK
> Email: LaycockC uk ibm com
> Tel : (01438) 76-9460 (internal: 44-9460)
> Please respond to mauelshagen redhat com; Please respond to LVM general
> discussion and development <linux-lvm redhat com>
> Sent by: linux-lvm-bounces redhat com
> To: LVM general discussion and development <linux-lvm redhat com>
> cc: hjm redhat com
> Subject: Re: [linux-lvm] It never rains...
> On Sat, Mar 20, 2004 at 08:02:03AM +0000, Chris Laycock wrote:
> > Hi All,
> > Had a bit a disaster, lost 1 disk from a 3 disk VG and the root
> > All on fully patched RH 9 system.
> > I realise that I need to attach the 2 remaining PV to a LV and VG but if
> > do the usual vgcreate, lvcreate & pvcreate I'll end up with two dataless
> > disks.
> No, you need to replace the failed drive, pvcreate the new one (same size
> as the dead one!) and vgcfgrestore the LVM metadata (see /etc/lvmconf/ and
> the vgcfgrestore manual page) to it in order to be able to vgscan+vgchange
> Presumably your 2 surviving drives have most of the data allocated you
> be able to gain access to (most of) your data.
> lvdisplay -v ... and pvdisplay -v ... are your friends to display the
> actual mappings of LVs to PVs and vice/versa once you recovered
> with vgcfgrestore.
> > I luckly do have backups of some of the more important data but there
> > a recenct as I'd like and don't contain all of the data or the root
> > partition.
> If critical data is allocated to the dead drive (eg, start of LV and
> a contained filesystem), you're in trouble and your (out-of-date) backup
> is your best bet.
> FYI: LVM2 has a --partial option for vgchange which will activate your VG
> ignoring any missing PVs.
> Heinz -- The LVM Guy --
> > Outputs from:
> > vgscan
> > vgscan -- reading all physical volumes (this may take a while...)
> > vgscan -- ERROR "vg_read_with_pv_and_lv(): current PV" can't get data of
> > volume group "datavg" from physical volume(s)
> > vgscan -- "/etc/lvmtab" and "/etc/lvmtab.d" successfully created
> > vgscan -- WARNING: This program does not do a VGDA backup of your volume
> > group
> > pvscan
> > pvscan -- reading all physical volumes (this may take a while...)
> > pvscan -- inactive PV "/dev/sda1" is associated to unknown VG "datavg"
> > (run vgscan)
> > pvscan -- inactive PV "/dev/hdc1" is associated to unknown VG "datavg"
> > (run vgscan)
> > pvscan -- total: 2 [45.75 GB] / in use: 2 [45.75 GB] / in no VG: 0 
> > pvdisplay /dev/hdc1
> > --- Physical volume ---
> > PV Name /dev/hdc1
> > VG Name datavg
> > PV Size 37.28 GB [78172227 secs] / NOT usable 4.19 MB
> > 165 KB]
> > PV# 2
> > PV Status available
> > Allocatable yes (but full)
> > Cur LV 1
> > PE Size (KByte) 4096
> > Total PE 9541
> > Free PE 0
> > Allocated PE 9541
> > PV UUID vozLHH-585D-SSjH-XM9b-A8g2-888k-5tZWI0
> > The two remaining disks are /dev/hdc1 & /dev/sda1
> > Thanks in advance
> > Regards,
> > Chris.
> > -------------------
> > Chris Laycock
> > IT Specialist
> > IBM Global Services (IDO)
> > LITS, Stevenage
> > Mail point: K3 STEV UK
> > Email: LaycockC uk ibm com
> > Tel : (01438) 76-9460 (internal: 44-9460)
> > _______________________________________________
> > linux-lvm mailing list
> > linux-lvm redhat com
> > https://www.redhat.com/mailman/listinfo/linux-lvm
> > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
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> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
*** Software bugs are stupid.
Nevertheless it needs not so stupid people to solve them ***
Heinz Mauelshagen Red Hat GmbH
Consulting Development Engineer Am Sonnenhang 11
Mauelshagen RedHat com +49 2626 141200
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