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The paper discusses the problem of ensuring QoS performance in wavelength-routed optical burst-switched (WR-OBS) networks under single link failures. The provision of IP services run over high-speed optical backbones should be resilient to faults in the network, hence the importance of a WR-OBS survivability investigation. A failure-compensating scheduling, residing in the WR-OBS control node, is proposed and analysed in terms of burst blocking probability and burst scheduling delay increment. The WR-OBS wavelength over-provisioning for maintaining guaranteed QoS is also studied as a function of network physical connectivity.