<i>L-DTC</i>: Load-based Dynamic Throughput Control for Guaranteed I/O Performance in Virtualized Environments

In this paper, we identified an issue where the I/O performance of specific tasks could not be guaranteed during multi-process I/O operations, despite the use of the latest storage technologies in virtualized environments. To address this issue, we propose <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">L-DTC</i>, a novel Load-based Dynamic Throughput Control technique, designed to achieve the guaranteed I/O performance in virtualized environments. Operating at the hypervisor level, <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">L-DTC</i> provides fine-grained throughput control based on I/O queues and ensures the independent I/O performance for each process by allowing users to define maximum and minimum throughput levels for each queue. We conducted an evaluation of <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">L-DTC</i> and confirmed that it successfully guarantees the I/O performance requirements of specific processes in multi-process environments. Furthermore, <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">L-DTC</i> achieved more stable I/O performance compared to existing methods, with improvements in I/O performance of up to 2.1 times, regardless of the I/O scheduler.