[linux-lvm] removing a failed disk from VG
Heinz J . Mauelshagen
mauelshagen at sistina.com
Tue Jan 28 04:50:02 UTC 2003
On Mon, Jan 27, 2003 at 09:28:08PM +0100, Alois Schneider wrote:
> I had a VG scsi_vg consisting of 4 PV's (sda1, sdb1, hdb1,hdc1).
> Now /dev/sdb1 failed and was no longer recogniced by th SCSI-
> controller. I had to remove it.
>
Alois,
then you probably lost data with the gone disk. Backup time :-(
Please make sure that you've got backups of /etc/lvmconf/* and /etc/lvmtab*
before you proceed.
There's 2 options:
a. you get a replacement drive (which can be a loop device)
of the same size (4G), run pvcreate on it, restore the metadata onto
it (vgcfgrestore) and run "vgscan ; vgchange -ay"
b. you implement LVM2/device-mapper and run "vgscan ; vgchange -P -ay", which
will activate your VG without the missing drive. This solution enables
you to retrieve the data still accessable _but_ won't let you change
your volume group configuration. We are working on an enhancement supporting
such changes.
Regards,
Heinz -- The LVM Guy --
> vgscan now fails with the following error:
>
> vgscan -- ERROR "vg_read_with_pv_and_lv(): current PV" can't get data
> of volume group "scsi_vg" from physical volume(s)
> vgscan -- reading all physical volumes (this may take a while...)
> vgscan -- "/etc/lvmtab" and "/etc/lvmtab.d" successfully created
> vgscan -- WARNING: This program does not do a VGDA backup of your
> volume group
>
> vgchange -ay gives
> -- no volume group found
>
> The remaining PV's seem to be ok and the failed disk was only 4Gb
> large.
>
> Here is the output of pvdisplay:
>
> --- Physical volume ---
> PV Name /dev/sda1
> VG Name scsi_vg
> PV Size 4.04 GB [8466192 secs] / NOT usable 1.88 MB
> [LVM: 125 KB]
> PV# 1
> PV Status available
> Allocatable yes (but full)
> Cur LV 1
> PE Size (KByte) 4096
> Total PE 1033
> Free PE 0
> Allocated PE 1033
> PV UUID pJsMFv-ci9Q-orNK-3cRr-2aTl-w1N9-TEHDI1
>
>
> --- Physical volume ---
> PV Name /dev/hdb1
> VG Name scsi_vg
> PV Size 76.69 GB [160826652 secs] / NOT usable 4.25 MB
> [LVM: 200 KB]
> PV# 3
> PV Status available
> Allocatable yes (but full)
> Cur LV 2
> PE Size (KByte) 4096
> Total PE 19631
> Free PE 0
> Allocated PE 19631
> PV UUID u5I40y-Op34-nnVV-aInj-Jekc-VJT7-s2q8OK
>
>
> --- Physical volume ---
> PV Name /dev/hdc1
> VG Name scsi_vg
> PV Size 19.01 GB [39873267 secs] / NOT usable 4.18 MB
> [LVM: 143 KB]
> PV# 5
> PV Status available
> Allocatable yes
> Cur LV 1
> PE Size (KByte) 4096
> Total PE 4866
> Free PE 2040
> Allocated PE 2826
> PV UUID 3PCGsY-hUr6-QEUt-MkoJ-fKlX-24vG-pS0HJY
>
> What can I do? How can I remove the no longer existing PV sdb1 from
> scsi_vg?
>
> Any help will be appreciated.
> Regards
> Alois
>
>
> _______________________________________________
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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 ***
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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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