GReM: Dynamic SSD resource allocation in virtualized storage systems with heterogeneous IO workloads

Zhengyu Yang, Jianzhe Tai, Janki Bhimani, Jiayin Wang, Ningfang Mi, Bo Sheng
2016 2016 IEEE 35th International Performance Computing and Communications Conference (IPCCC)  
In a shared virtualized storage system that runs VMs with heterogeneous IO demands, it becomes a problem for the hypervisor to cost-effectively partition and allocate SSD resources among multiple VMs. There are two straightforward approaches to solving this problem: equally assigning SSDs to each VM or managing SSD resources in a fair competition mode. Unfortunately, neither of these approaches can fully utilize the benefits of SSD resources, particularly when the workloads frequently change
more » ... bursty IOs occur from time to time. In this paper, we design a Global SSD Resource Management solution -GREM, which aims to fully utilize SSD resources as a secondlevel cache under the consideration of performance isolation. In particular, GREM takes dynamic IO demands of all VMs into consideration to split the entire SSD space into a long-term zone and a short-term zone, and cost-effectively updates the content of SSDs in these two zones. GREM is able to adaptively adjust the reservation for each VM inside the long-term zone based on their IO changes. GREM can further dynamically partition SSDs between the long-and short-term zones during runtime by leveraging the feedbacks from both cache performance and bursty workloads. Experimental results show that GREM can capture the cross-VM IO changes to make correct decisions on resource allocation, and thus obtain high IO hit ratio and low IO management costs, compared with both traditional and state-ofthe-art caching algorithms.
doi:10.1109/pccc.2016.7820658 dblp:conf/ipccc/YangTBWMS16 fatcat:ejndpnekqjekrcogvmuismlif4