[linux-lvm] Exposing the same VG from two different disks
Bryn M. Reeves
bmr at redhat.com
Fri Jun 5 13:50:21 UTC 2009
On Fri, 2009-06-05 at 15:18 +0200, liam at landv.org.uk wrote:
> Hi,
>
> I'm not sure if what I'm trying to do is possible or not but hopefully
> someone out there can help!!
>
> I have a volume group which consists of a LUN (/dev/emcpowerv1) in an
> EMC cabinet. To backup up the disk I use EMC technology to synchronise
> a second LUN (/dev/emcpoweraf1) with the first, when the
> synchronisation is complete I then break the connection. At this point
> I have two identical volume groups exposed to the same host. What I
> would like to do is rename the second volume group and mount its
> logical volumes. However I can't because (understandably) LVM doesn't
> like having two identical volume groups so when I issue pvchange -u I
> get...
>
>
> # pvchange -u /dev/emcpoweraf1
> Found duplicate PV dXiYI6nVqu8UpXO2mlaWiKKPKSBPrRbn: using /dev/emcpowerv1 not /dev/emcpoweraf1
> get_pv_from_vg_by_id: vg_read failed to read VG !
> /dev/emcpowerv1: write failed after 0 of 4096 at 4096: Operation not permitted
> pv_write with new uuid failed for /dev/emcpowerv1.
> 0 physical volumes changed / 1 physical volume not changed
>
> Notice I issue the command against /dev/emcpoweraf1 but it complains about writing to /dev/emcpowerv1.
Take a look at the vgimportclone script posted to the lvm-devel list
last month:
http://www.redhat.com/archives/lvm-devel/2009-May/msg00130.html
Regards,
Bryn.
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