
i
i
“K16304” — 2012/11/19 — 9:15
i
i
i
i
i
i
52
Fault Tolerance
Spurious Failovers
Figure 2.19 plots, for each PMR setting, the fraction of 80MB file transfers that
experience at least one spurious failover at primary path loss rates 0-10%. The graph
aggregates all alternate path loss rates for each particular primary path loss rate.
Figure 2.19 Fraction of transfers with spurious failovers.
Since PMR = 0 triggers a failover on a single timeout, this setting provides little
robustness against spurious failovers at loss rates greater than 1%. At the other ex-
treme, PMR = 5 experiences nearly no spurious failovers at loss rates less than 8%.
As PMR increases from ...