On Fri, May 25, 2012 at 6:28 PM, Andreas Dilger <adilger@xxxxxxxxx> wrote: > On 2012-05-25, at 9:59, Alexander Block <ablock84@xxxxxxxxxxxxxx> wrote: > > Are you talking about the atime for the primary copy, or the atime for the snapshots? IMHO, the atime should not be updated for a snapshot unless it is explicitly mounted r/w, or it isn't really a good snapshot. > Snapshots are by default r/w but can be created r/o explicitly. But that doesn't matter for the normal use case where you snapshot / and continue working on /. After snapshotting, all metadata is shared between the two subvolumes, but when a metadata block in one of both subvolume changes (no matter which one), this one metadata block get's cowed and unshared and uses up more space. -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
