Abstract
In the cloud datacenter, for the multi-tenant model, network resources should be fairly allocated among VDCs (virtual datacenters). Conventionally, the allocation of cloud network resources is on a best-effort basis, so the specific information of network resource allocation is unclear. Previous research has either aimed to provide minimum bandwidth guarantee, or focused on realizing work conservation according to the VM-to-VM (virtual machine to virtual machine) flow policy or per-source policy, or both policies. However, they failed to consider allocating redundant bandwidth among VDCs in a fair way. This paper presents a bandwidth that guarantees enforcement framework NXT-Freedom, and this framework allocates the network resources on the basis of per-VDC fairness, which can achieve work conservation. In order to guarantee per-VDC fair allocation, a hierarchical max–min fairness algorithm is put forward in this paper. In order to ensure that the framework can be applied to non-congestion-free network core and achieve scalability, NXT-Freedom decouples the computation of per-VDC allocation from the execution of allocation, but it brings some CPU overheads resulting from bandwidth enforcement. We observe that there is no need to enforce the non-blocking virtual network. Leveraging this observation, we distinguish the virtual network type of VDC to eliminate part of the CPU overheads. The evaluation results of a prototype prove that NXT-Freedom can achieve the isolation of per-VDC performance, which also shows fast adaption to flow variation in cloud datacenter.
Highlights
As cloud computing has become more mature, many companies start to put their own applications in the cloud datacenters
After the virtual network (VN) is mapped to the underlying physical network and the redundant bandwidth is fairly allocated among tenants, we enforce these bandwidth guarantees
After the VN is mapped onto physical network (PN), the upper limit of the sending/receiving rate for each VM will be set according to the redundant bandwidth of every access link that the VN is mapped to, and the intermediate redundant link bandwidth will be calculated
Summary
As cloud computing has become more mature, many companies start to put their own applications in the cloud datacenters. This paper presents NXT-Freedom, which is a novel architecture used to enforce the fair allocation of bandwidth in cloud datacenters based on VDC. It can simultaneously achieve VDC-based fair bandwidth guarantees and work-conservation by a centralized bandwidth allocator (BA), and the per-VDC congestion is controlled by distributed bandwidth enforcers (BE). An VDC-based fair bandwidth allocation algorithm, making that each flow of the VDC could get network resources on demand in best efforts. It achieves high network utilization while ensuring VDC-based fairness.
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