On Fri, 13 Nov 2015, Gordon Messmer wrote: >Breaking a RAID volume doesn't make filesystems consistent, While using LVM arranges for some filesystems to be consistent (it is not always possible), it does nothing to ensure application consistency which can be just as important. Linux doesn't have a widely deployed analog to Windows' VSS, which provides both though only for those that cooperate. On Linux you must arrange to quiesce applications yourself, which is seldom possible. >Breaking the >RAID will duplicate UUIDs of filesystems and the name of volume groups. Making an LVM snapshot duplicates UUIDs (and LABELs) too, the whole LV is the same in the snapshot as it was in the source. There are ways to cope with that for XFS (I usually use mount -ro nouuid) -- ext2/3/4 doesn't care (so just mount -r for them). If the original filesystem isn't yet mounted then a mount by uuid (or label) would not be pretty for either. And that's just two filesystems, others are supported and they too will potentially have issues. /mark