The Active Block I/O Scheduling System (ABISS) is an extension of the storage subsystem of Linux. It is designed to provide guaranteed reading and writing bit rates to applications, with minimal overhead and low latency.

In this paper, the various components of ABISS as well as their actual implementation are described. This includes work on the Linux elevator and support for delayed allocation.

In a set of experimental runs with real-life data we have measured great improvements of the real-time response of read and write operations under heavy system load.

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