Tore Anderson [tore@xxxxxxxxx] wrote: > * S. J. van Harmelen > > > I have a couple of LUN's that are handled by the multipath driver. > > This works great, but now I want to use LVM so I can take snapshots > > of one LUN to another LUN. > > > > Can someone tell me how to do this? > > > > When I do pvcreate /dev/mapper/diskname I get an error that the disk > > is already part of an volume group. But I sertainly did not configure > > that. > > > > Can it be that the multipath driver of devmapper did that? > > If you have a PV signature on the volume, LVM might have used one of the > paths instead of using the multipath'ed device under /dev/mapper. You > should be able to check this by running the command "pvs" - it should > list all the detected PVs on your system. If LVM uses single pathed disks like /dev/sda, then multipath can't use the same path to make a multipathed device, right? My guess is that /dev/mapper/multipath-name is indeed part of the LVM in your case. I would like to know what happened otherwise. Thank you. --Malahal. -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
