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    SubjectRe: atime and filesystems with snapshots (especially Btrfs)
    On Fri, May 25, 2012 at 6:28 PM, Andreas Dilger <> wrote:
    > On 2012-05-25, at 9:59, Alexander Block <> 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.
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      Last update: 2012-05-25 19:01    [W:0.023 / U:2.536 seconds]
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