When I create LVM, there is a 50/50 chance that I get this message: LV XenGuest/fcnode003 in use: not deactivating Couldn't deactivate new snapshot. As you can potentially guess, I am using Xen on a fedora core 5 system and am attempting to create clones of a root Xen machine. In doing some googling about this problem, I discovered that this problem seems to exist in other distros as well and the fix is to change the configuration in /etc/udev.rules from: KERNEL=="dm-[0-9]*", NAME="" to: KERNEL=="dm-[0-9]*", OPTIONS+="ignore_device" I ended up changing the /dev/udev/rules.d/40-multipath.rules file and adding the line since the problem line does not seem to exist in any of the rules files. After restarting udevd, I seem to no longer have the problem. On the other hand, I might be just getting lucky. Does anyone know if this is the proper fix for Fedora's configuration? Is there a plan to fix this problem another way? If not, will this configuration change be made as part of the distribution as (at least) a short term fix? Does anyone know if RedHat has acknowledged the problem and working on fix? Thanks for any input.