For example we might write ten megabyte data extents, plus four blocks to complete an atomic commit, including one log block, giving a write multiplier of 1.0016. Note that this multiplier includes all metadata. In our "rollup" a few more blocks may need to be accounted to the multiplier, maybe pushing it up to 1.003, or maybe not moving the needle at all because those retained blocks may be amortized over many deltas. In other words, we often write dirty metadata blocks zero times, rounding down modestly.
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