Description

Abstract

In cloud computing, resource subscription is an important procedure which enables customers to

elastically subscribe to IT resources based on their service requirements. Resource subscription

can be divided into two categories, namely long term reservation and on-demand subscription.

Managing resources at large scale while providing performance isolation and efficient use of

underlying hardware is a key challenge for any cloud management software. Most virtual machine

(VM) resource management systems like VMware DRS clusters, Microsoft PRO and Eucalyptus,

do not currently scale to the number of hosts and VMs needed by cloud offerings to support the

elasticity required to handle peak demand. In addition to scale, other problems a cloud-level

resource management layer needs to solve include heterogeneity of systems, compatibility

constraints between virtual machines and underlying hardware, islands of resources created due to

storage and network connectivity and limited scale of storage resources.