I am having the same issue as this previous post to the lvm list, but cannot find if anyone ever had a solution for it: <div>Author: Tommaso Cecchi Date: 2006-07-19 11:35<noscript>2006-07-19 16:35</noscript> -500<noscript>UTC</noscript> To: LVM general discussion and development Old-Topics: <a href="http://archives.free.net.ph/message/20050524.063104.84b50c45.en.html">RE: [linux-lvm] "pvchange --uuid" failed when PV is in use</a> Subject: [linux-lvm] duplicate PV </div>Hello everyone, I have the following problem: I want to use a snapshot mechanism external to LVM2 (i.e. snapshot from the storage server) so it happens that I access from a linux box two identical LUNs with the same PVID. It is not a matter of multipathing, they just are completely different devices with the same content (and with the same PVID of course). What I would like to do is to use and mount the second device on a different mount point. So: /dev/sdd1 is the primary PV /dev/sdf1 is the snapshot of the primary PV The result of pvscan before the discovery is: drdb2:~ # pvscan PV /dev/sde1 VG drrg2_vg lvm2 [200.00 GB / 0 free] PV /dev/sdd1 VG test_vg lvm2 [200.00 GB / 0 free] PV /dev/sdb1 VG oracledb_vg lvm2 [220.00 GB / 0 free] PV /dev/sdc1 VG oracledb_vg lvm2 [20.00 GB / 0 free] PV /dev/sda3 VG root_vg lvm2 [59.75 GB / 47.26 GB free] Total: 5 [699.73 GB] / in use: 5 [699.73 GB] / in no VG: 0 [0 ] after the discovery of the new device is: drdb2:~ # pvscan Found duplicate PV PnvnzL7YFft76Ky0EaPbOh519SQD5Uxc: using /dev/sdf1 not /dev/sdd1 PV /dev/sde1 VG drrg2_vg lvm2 [200.00 GB / 0 free] PV /dev/sdd1 VG test_vg lvm2 [200.00 GB / 0 free] PV /dev/sdb1 VG oracledb_vg lvm2 [220.00 GB / 0 free] PV /dev/sdc1 VG oracledb_vg lvm2 [20.00 GB / 0 free] PV /dev/sda3 VG root_vg lvm2 [59.75 GB / 47.26 GB free] Total: 5 [699.73 GB] / in use: 5 [699.73 GB] / in no VG: 0 [0 ] I guess this problem is the same I'd have if I copy any single byte from a device to another the last one resulting in having the same LVM label. What I tried is to: 1) vgreduce: drdb2:~ # vgreduce test_vg /dev/sdf1 Found duplicate PV PnvnzL7YFft76Ky0EaPbOh519SQD5Uxc: using /dev/sdf1 not /dev/sdd1 Physical Volume "/dev/sdf1" not found in Volume Group "test_vg" sdf1 does not belong to test_vg 2) pvchange --uuid: drdb2:~ # pvchange --uuid /dev/sdf1 Found duplicate PV PnvnzL7YFft76Ky0EaPbOh519SQD5Uxc: using /dev/sdd1 not /dev/sdf1 Volume group containing /dev/sdf1 has active logical volumes 0 physical volumes changed / 1 physical volume not changed My idea was to modify the PVID so to let LVM understand they are completely different devices. How can I manage this? Thanks for any help you may give me. Tommaso <pre class="art">-- ================================================================ | Tommaso Cecchi CINECA | System Management Group Via Magnanelli 6/3 40033 | e-mail: t.cecchi@??? Casalecchio di Reno | Tel: 051/6171411 Bologna - ITALY | Fax 051/6132198 <a class="url" href="http://www.cineca.it/">http://www.cineca.it</a> ================================================================</pre> <pre class="art">_______________________________________________ linux-lvm mailing list Any help is greatly appreciated. Thanks! Koree linux-lvm@??? <a class="url" href="https://www.redhat.com/mailman/listinfo/linux-lvm">https://www.redhat.com/mailman/listinfo/linux-lvm</a> read the LVM HOW-TO at <a class="url" href="http://tldp.org/HOWTO/LVM-HOWTO/">http://tldp.org/HOWTO/LVM-HOWTO/</a></pre> -- Koree A. Smith, RHCE -- <a href="mailto:koreesmith@gmail.com">koreesmith@gmail.com</a> <a href="mailto:koree@ameth.org">koree@ameth.org</a>