云計(jì)算平臺(tái)虛擬機(jī)-全文預(yù)覽
【正文】 over CentOS on identical hardware. Since the Slackware system had such a small memory footprint, larger problem sizes could be used while still avoiding swapping. Boot times for virtual machines were parable to the actual postbootloadertimeout portion of the physical machine boot processes, even though more processes were started in the VM39。s,recursive panel fact.(RFACT39。s,the physical cluster provided DHCP and DNS services to the order to maintain a single con guration source,DHCP and DNS con guration les were generated from the LDAP database by a custom utility. These utilities were required to be run whenever the host information in LDAP is VCN images were maintained on an NFS export that was mounted on each physical pute images were accessed in a readonly mode since KVM39。s,each with . CentOS provides substantial outofthebox support for cluster puting applications and,along with its cousin,Red Hat Enterprise Linux,is widely supported in the scienti c and highperformance puting two VCN39。3Table KV M XenT ype1Hypervisor T ype2HypervisorHost is a privileged guest Host directly on hardwareUnprivileged guests Guests have user privilegesx86ring abstraction UNIX process abstractionP aravirtualized guests Unmodified guests Virtual Machine(KVMThe Kernelbased Virtual Machine(KVMis a Type2hypervisor maintained by Qumranet,Inc[Habib2008][Qumranet2006].KVM is based on the QEMU emulator and derives all its management tools from main focus of KVM development is to use the x86VT extensions,which allow virtual machines to make system calls[van Doorn2006].KVM versions newer than KVM62have support for paravirtualized Linux guests,but we did not utilize this capability in our initial prototype.KVM uses a set of Linux kernel modules to provide VT can run on a stock Linux kernel that is:(anew enough and(bhas had the KVM modules built for contrast,Xen requires a heavily patched Linux kernel,on which development lags behind the mainline kernel.KVM supports the QEMU Copyonwrite(QCOWdisk image format,allowing it to support a snapshot mode for its disk I/O snapshot mode, all disk writes are directed to a temporary le,and changes are not persisted to the original disk image VM39。s without having to worry about hardware or software VO is free to develop a model cluster locally,perhaps even on a personal workstation,test it,andAuthors39。[ComputerCommunication Networks]:Distributed SystemsGeneral Terms:Design,Experimentation,Measurement,PerformanceAdditional Key Words and Phrases:Virtual Machines,KVM,HighPerformance ComputingA current problem in scienti c puting is that the expertise needed to deploy and maintain a cluster remains scarce despite recent declines in hardware costs. Smaller research groups may not be able to a ord to have their own clusters,and purchasing time on an existing cluster raises concerns such as vendor lockin and data security.In this paper,we present a cloud puting model which de nes a minimum speci cation for a pute cluster39。Performance attributes。scan purchase pute power from VSP39。s hardware with reasonable assurances that the operating environment will be fully patible.We will rst provide a brief overview of virtualization technologies,followed by a description of our model virtual ,we will de ne the infrastructure for which an VSP would be ,we will presen
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