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

In this letter, 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 L-DTC, a novel Load-based Dynamic Throughput Control technique, designed to achieve the guaranteed I/O performance in virtualized environments. Operating at the hypervisor level, L-DTC 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 L-DTC and confirmed that it successfully guarantees the I/O performance requirements of specific processes in multi-process environments. Furthermore, L-DTC 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.