Christoph Hellwig wrote: > > what about LVM? iv'e read somewhere that it used to just eat barriers > > used by XFS, making it less safe than simple partitions. > > Oh, any additional layers open another by cans of worms. On Linux until > very recently using LVM or software raid means only disabled > write caches are safe.
I believe that's still true except if there's more than one backing drive, so software RAID still isn't safe. Did that change? But even with barriers, software RAID may have a consistency problem if one stripe is updated and the system fails before the matching parity stripe is updated. I've been told that some hardware RAID implementations implement a kind of journalling to deal with this, but Linux software RAID does not. -- Jamie -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
