Dynamic resource allocation using auto-negotiation in Haizea

Higher hardware utilization and SLA fulfillment are two main objectives of any infrastructure cloud, thus, making resource allocation to virtual machines as one of the most critical aspect. Haizea is a popular cloud lease manager which supports a variety of resource leases according to the application requirements. These leases are: Immediate, Best-Effort, Deadline Sensitive and Advance Reservation (AR). But all these leases are static in nature viz. once resources are allocated to a lease, these resources cannot be altered during the complete lifetime of the lease. This contradicts with the philosophy and implementation of a pure on-demand elastic cloud where resources of a lease are continuously monitored against the utilization and altered based on the requirements. Our work aims at the inclusion of three important features to mitigate this shortcoming in Haizea. First, it introduces a new class of lease: Dynamic lease to accommodate resource changes. Second, it examines virtual machine resource utilization to decide about the demand and need of allocation change and third, it accommodates the expected changes in resource allocation by introducing two new sub-leases which allow dynamic resource allocation in the schedule. Lease experiments are performed on Haizea to validate the introduced features.