2016 Public Cloud Provider Buyer s Guide
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1 2016 Public Cloud Provider Buyer s Guide
2 public s In this e-guide: With the proliferation of public s out there from Amazon Web Services, to Rackspace, Google, and Microsoft it has become a daunting task for IT administrators to determine which, if any, is right for their enterprise. This comprehensive guide walks readers through the of using public cloud services, how to weigh the pros and cons of each and the steps to take during the buying process if/when the decision is made. Page 1 of 27
3 public s With companies such as Amazon Web Services, Google, Microsoft and Rackspace offering the ability to create virtual machines in the cloud to support and replace physical servers, cloud virtualization services are being integrated into data center infrastructures. But knowing which features to consider and which vendors to compare can be a daunting task. This article is the first in a series that walks through the buying process for public cloud virtual server services. Here we cover the major of using public cloud services as an extension of your data center infrastructure. The second article discusses the risks and costs associated with moving virtual machines (VMs) to the public cloud. The third article focuses on purchasing criteria and preparing a vendor request for proposal (RFP). Finally, the series will compare market-leading services against established criteria and against each other to help you select the best public cloud service for your environment. Page 2 of 27
4 public s In most cases, established organizations with IT resources on-premises should not dispose of existing servers and move everything to the cloud. It would be a waste of money, unless the local resources were scheduled to be retired. Even then, there may be some workloads, such as latency-sensitive ones, that should run locally. Similarly, you might not want to put all of your domain controllers on a public cloud. Of course, this does not mean companies with established IT infrastructures cannot benefit from the cloud. The best approach is often to treat the cloud as an extension to the organization's existing IT footprint. In this feature, we look at the of using public cloud versus an on-premises data center. In the second part of this feature, we'll cover the disadvantages of public cloud. Workload scaling There are multiple ways a data center from being extended to the cloud, and one involves workload scaling. There may be times your organization needs to ramp up a production workload beyond what the local data center can comfortably handle. Page 3 of 27
5 public s For example, consider the way insurance companies operate. For most of the year, insurance companies typically consume a predictable level of IT resources. However, there may be open enrollment periods that occur throughout the year. These enrollment periods are especially busy for insurance companies. As a result, existing servers may not be able to handle open enrollment workloads. Rather than buy new servers to accommodate temporary spikes in demand, the companies could use public cloud. If the company's enrollment applications are Web-based, it would be relatively easy for cloud-based Web servers to accommodate the seasonal demand. Once open enrollment is over, the cloud-based Web servers can be decommissioned. Business continuity Another advantage of cloud-based VMs is protecting businesses in case of equipment failures or physical disasters. Page 4 of 27
6 public s To protect against data center failures, some organizations build geographic clusters that span multiple data centers. Then, if a natural disaster destroys an organization's primary data centers, mission-critical workloads fail over to secondary data centers. Building geoclusters, however, is expensive and complicated. Alternatively, organizations can use public cloud to protect mission-critical workloads using guest clusters and VM replication. Guest clusters are clustered application servers that run on virtual hardware. Since all of the guest cluster nodes are VMs, it's possible to place some of the cluster nodes in the public cloud. That way, critical workloads can continue to function even if primary data centers go offline. However, you probably can't include public cloud servers in existing hypervisor clusters. Public s typically don't give customers low-level access to physical servers, which makes stretching an existing hypervisor cluster to the public cloud nearly impossible. Another way to use public cloud for business continuity is through VM replication. Not every provider or server virtualization platform supports Page 5 of 27
7 public s replication, but some cloud and hypervisor combinations allow duplicate VMs to be created in the cloud and kept in sync with on-premises VMs. Similarly, there are solutions that allow public clouds to act as relays between private data centers for VM replication. If any primary data centers go down, VM replicas can be used. Public cloud VM deployment can be simpler than on-premises deployment because public s typically offer templates to generate new VMs. Templates are used to automate VM creation. And, because they don't require manual installation of guest operating systems, templates cut down on administrators' work. Some templates even include pre-installed applications. Public cloud VM deployments are especially attractive for startups. Any new business incurs startup costs, but operating virtual servers in the cloud eliminates the capital expenditures associated with server hardware and software. Cloud-hosted VMs are usually billed on a monthly basis. For a startup, this monthly charge is likely far less than the hardware and software costs required Page 6 of 27
8 public s to run the workload locally. A startup organization can first run a workload in the cloud, and then later bring network load on-premises. cloud provider As organizations transition to public or hybrid cloud, they inevitably have to choose a public to host their cloud-based virtual machines. And while there are many infrastructure as a service (IaaS) providers, each has its own strengths and weaknesses. Furthermore, each public has its own pricing structure, so the cost of running a VM in the cloud could differ substantially from one provider to the next. This article is the third in a series that walks through the buying process for public cloud virtual server services. The first article described the of Page 7 of 27
9 public s hosting virtual servers in the cloud, while the second detailed public cloud costs and risks. This article outlines the purchasing criteria to include in a vendor request for proposal (RFP) to ensure you get the right services for your environment. The fourth article will compare market-leading public cloud virtual server services against established purchasing criteria and against each other to help you determine which service offers the best features and price for your needs. Determining public cloud costs New public cloud users are often surprised to learn that IaaS has a complicated pricing structure. You will rarely, if ever, find flat rate pricing for running a virtual machine (VM) in the cloud. And although s disclose their pricing formulas, they tend to be extremely complex, making it difficult to estimate the cost of running a public cloud VM. These formulas are complex because they're based on the resources VMs consume. Some of the factors included in public cloud pricing structures are CPU consumption, the type of CPU activity being performed, network bandwidth Page 8 of 27
10 public s consumption, storage I/O consumption, operating system (OS) selection, storage type and storage consumption on a per GB basis. Before running a VM in the cloud, set up trial accounts with different cloud providers. This will create identical VMs on each cloud, and track costs. You can then compare how pricing differs from one provider to another. For this method to work, however, the VMs must be somewhat representational of what you will run in your production environment. VM migration to public cloud Another important consideration is VM migration support. Most organizations have on-premises VMs they will migrate to public cloud. Most of the major public s offer a mechanism for importing existing VMs into the cloud, but some are easier to use than others. Some providers will give you a graphical interface, while others require the operation be performed programmatically. Page 9 of 27
11 public s Hypervisor support also varies widely among public s. For example, some providers make it easy to import VMware VMs, but do not support Citrix VMs. Be aware of VM migration costs. Most public s charge you for the resources you use, including the storage space the new VMs occupy. Some s -- particularly the smaller ones -- may impose a surcharge for importing VMs. Custom image support Any public allows you to create VMs based on precompiled generic images. But because they're generic, these images may not fully meet your needs. For example, you may want to create VM images that include your preferred antivirus software, or that adhere to specific security requirements. These custom VM images make it easy to configure VMs to meet your specific needs, and to reproduce those configurations on future VMs. However, if you plan to create custom VMs in the cloud, you need to make sure your provider supports that process. And while major public s tend to offer that support, some make it easier than others to import those images. If you are Page 10 of 27
12 public s considering smaller public s, make sure you understand their custom VM image support before signing on. VM templates While any public allows you to create generic VMs based on predefined templates, the complexity and number of those templates varies wildly. Generic VM templates typically include an OS and, possibly, the ability to build application servers. Providers don't always offer the same OSes or applications, if they offer applications at all. Most of the major public clouds allow you to create Windows and Linux VMs, although the Windows Server versions and the Linux flavors offered vary. If you are considering smaller providers, confirm their template catalog allows you to deploy the computing environments and applications you require. Autoscaling Another essential feature to look for when evaluating s is autoscaling. The basic idea of autoscaling is that server workloads are rarely linear. Sometimes, there are performance demand peaks, such as insurance companies' open enrollment periods or online retailers' big holiday sales. At Page 11 of 27
13 public s other times, usage demand shrinks. Autoscaling allows VMs to deliver higher performance in response to heavier workloads, and to scale down when possible to save money. Autoscaling varies across different cloud platforms. Some providers only offer it for web applications by bringing extra web servers online. Others increase VM memory and CPU resources to perform workload scaling. This can be done manually, or can be automated based on a set of rules, performance metrics or a schedule. Network connectivity Every cloud service provider offers VM network connectivity. It's a given that your VMs will be able to access one another and the Internet. Even so, the larger s typically offer multiple network connectivity options. They vary between providers, but there are usually premium connectivity options that allow VMs to receive higher network performance levels. This is especially useful for VMs running applications that are sensitive to network latency. If you plan to run cloud-based, latency-sensitive applications, be sure to investigate your potential 's networking options. Page 12 of 27
14 public s Storage choices Just as every allows for basic VM network connectivity, they also offer basic VM storage. After all, VMs use virtual hard disks, and you have to put them somewhere. Many cloud service providers also offer options beyond basic, entry-level storage. Storage services vary tremendously from one provider to another, but, at a minimum, there are usually standard and premium options. The larger cloud providers tend to offer a lot of customization as part of their premium storage. For instance, customers might be able to choose between rotational storage and solid-state storage, although solid-state storage is almost always more expensive. Premium storage may also include fault-tolerant options. Some cloud service providers allow you to replicate storage or build virtual storage arrays that boost performance and ensure fault tolerance. Although somewhat rare, some providers also allow you to use premium storage to create VM snapshots or for backup targets. Page 13 of 27
15 public s When evaluating service providers, it's important to pay attention to the storage types offered. Some providers only offer object storage, which is very different from the block and file storage normally used in local data centers. Similarly, some providers treat databases as storage options, while others treat databases as VMs. Regional support Pay attention to s' regional availability. Larger s establish data centers all over the world. If you have regulatory or business requirements that mandate your data be kept within a specific country, it's extremely important to be able to choose which data centers will host your VMs. In the event of a provider outage, it's also critical to ensure your VMs will not fail over to unauthorized regions. Examine each 's specific regional offerings. Some providers use lower-end servers in certain regions. Likewise, some OSes or OS features, such as encryption, may not be available in certain regions due to regulations. As you can see, there are a number of criteria to consider when evaluating cloud service providers. Not all providers are created equally, so it's necessary Page 14 of 27
16 public s to look for the provider that will best meet the technical needs of your environment, and the business needs of your organization. public cloud providers You've done your homework and determined you need to extend your data center to the public cloud. You've researched the technology and determined the criteria you will use to make your purchasing decision. Now, it's time to choose the public to host your virtual machines. But which provider offers the services and support that best matches your environment and needs? This is the final article in a series about cloud computing buying decisions. The first article described the of hosting virtual servers in the cloud, while the second detailed public cloud costs and risks. Page 15 of 27
17 The third article detailed the purchasing criteria to include in your vendor request for proposals (RFPs) to make sure you get the right services for your environment. public s This article compares four leading public s -- Amazon Web Services (AWS), Google, Microsoft and Rackspace -- and how well they meet the following seven criteria: VM migration support Custom image support Image library Autoscaling Network connectivity Storage choices Regional support 1. VM migration support As public and hybrid clouds increase in popularity, it's important for organizations to be able to move virtual machines (VMs) from an on-premises Page 16 of 27
18 public s hypervisor into the public cloud, and to bring those workloads back in house if necessary. AWS offers the most seamless VM migration path of all the major cloud providers, although Microsoft is not far behind. AWS provides a graphical interface called the AWS Management Portal for vcenter which allows virtualization admins to manage their Amazon-based resources through VMware vcenter. The portal also makes it possible to migrate VMware VMs to the public cloud. Microsoft built its Azure public cloud on top of Windows Server and Hyper-V. Because Azure runs the same software as many on-premises networks, it is relatively easy to migrate VMs between local data centers and Azure. The process isn't seamless, but is relatively easy once connectivity is established between Azure and a local network. Google does not support VM migrations into the Google Compute Engine cloud. However, there are third-party providers, such as Cohesive Networks, which allows VMs to be imported into Google Compute Engine. Page 17 of 27
19 public s Rackspace does not offer a way to migrate VMs to and from the cloud. It does, however, provide a service called RackConnect that's geared toward hybrid clouds. 2. Custom image support Cloud providers generally allow VMs to be built from predefined images, but these generic OS images don't always meet an organization's needs. As such, a should allow custom virtual machine images to be created and used. AWS provides Amazon EC2 API tools which can be used to import VM images into the Amazon cloud. AWS allows for the importing of: VMware ESX and VMware Workstation VMDK images; Citrix XenServer virtual hard disk (VHD) images; Microsoft Hyper-V VHD images for Windows Server 2003, Windows Server 2003 R2, Windows Server 2008, Windows Server 2008 R2, Windows Server 2012 and Windows Server 2012 R2; and Page 18 of 27
20 Red Hat Enterprise Linux (RHEL) , (using Cloud Access), Centos , , Ubuntu 12.04, 12.10, 13.04, 13.10, 14.04, 14.10, and Debian , public s Microsoft makes it fairly easy to create a custom image. The easiest way is to create a virtual hard disk file and import it into Azure. Although you can build VHD-based images from scratch, System Center Virtual Machine Manager can help with the image creation process. Rackspace supports the creation of custom images, which can be imported and exported from its cloud environment. Rackspace also provides a custom API that can be used to share custom images. Google supports the importing of raw device mapping images, Amazon Machine Images and VirtualBox Images. 3. Image library Although many organizations try to minimize the number of server operating systems they use, heterogeneous environments are becoming much more common, especially in the cloud. A good should offer a variety of server OS choices. Page 19 of 27
21 public s Rackspace offers a broad selection of server operating systems. It provides nearly a dozen different Linux variants, including Ubuntu, Red Hat Enterprise Linux and CentOS. In addition, Rackspace offers Windows Server 2008 and Windows Server Windows Server images can be preloaded with SQL Server or with SharePoint. The versions that are offered vary depending on the operating system you select. The available Windows Server 2008 images include Base OS, SQL Server 2008, SQL Server 2012, and SharePoint The available Windows Server 2012 images include R1 base image, R2 base image, R1 with SQL Server 2012, R1 with SharePoint 2013 and R2 with SQL Server Microsoft provides a variety of operating system images including Windows Server, Ubuntu, CoreOS, CentOS, SUSE, Oracle and Puppet Labs. Windows images can be deployed using only the base operating system, or they can include Microsoft server products such as SharePoint, SQL Server, BizTalk Server, Visual Studio or Microsoft Dynamics. AWS provides Windows-based images, as well as a variety of Linux images. The available Linux flavors include Red Hat Enterprise Linux, SUSE Linux, Ubuntu, Fedora, Debian, CentOS, Gentoo Linux, Oracle Linux and FreeBSD. Page 20 of 27
22 public s Google offers a collection of premium operating systems, including Red Hat Enterprise Linux, SUSE and Windows Server. 4. Autoscaling Workloads do not typically experience linear demand; instead, demand increases and decreases over time. Ideally, a should allow workloads to automatically scale up or down in response to current demand. Rackspace provides an autoscale feature that expands or shrinks your cloud according to a set of user-defined rules. These rules can include a schedule allowing workloads to scale up just prior to an expected demand spike, and scale down when the event passes. Microsoft includes a Scale page in the Azure interface. You can use this page to manually scale an application, or you can set parameters that will be used to automatically scale the workload. Google has an autoscaler that scales a workload up or down based on changing demand, and can be used with a managed instance group. Page 21 of 27
23 public s AWS provides autoscaling capabilities that can be enabled on a group basis. 5. Network connectivity Network connectivity is another important consideration when choosing a public. There should be a way to connect your on-premises network to your cloud network, and the provider should offer various connectivity features. AWS offers something it calls Enhanced Networking. This service is available for Windows and Linux VMs, and offers higher-performance networking than what is delivered out of the box. Enhanced Networking is specifically designed to provide low latency and low jitter, and is enabled by default for Amazon Machine Images based on Windows Server 2012 R2 and Linux HVM. Rackspace offers several networking options. Extreme Networking, for example, is Rackspace's high-bandwidth solution that uses twin bonded 10 Gbps connections. A more generic Rackspace option is Cloud Networks, which allows for multi-tier software-defined networks. Rackspace also offers cloud load balancers and IPv6 support. Google Compute Engine provides all the basic cloud networking capabilities, but also cloud load balancing and cloud DNS. In addition, Google offers an Page 22 of 27
24 public s interconnect feature that allows customers to establish connectivity to the Google cloud either directly or via VPN. Microsoft designed Azure to easily support hybrid clouds. Although you can define virtual networks within Azure, it is also possible to connect Azure to your corporate network through point-to-point VPN. By doing so, the Azure network acts as an extension of an on-premises network. For instance, a cloud application might access a local SQL Server database. 6. Storage choices Storage needs vary depending on workloads. Some workloads can use commodity storage without any issues, while others require high-performance storage. As such, a should offer a variety of storage options. Amazon EC2 includes basic storage for VMs, but the service is really designed to connect to Amazon's Elastic Block Store (EBS) service, which is designed to be scalable, flexible and fault tolerant. For instance, storage can be provisioned as general purpose, with solid-state disk (SSD) and hard disk drive (HDD) options available, or Provisioned IOPS. Furthermore, Amazon EBS supports the Page 23 of 27
25 public s use of point-in-time consistent snapshots. AWS also offers a variety of fault tolerant storage configurations. Microsoft provides basic storage for its Azure VMs. In addition, Microsoft offers premium storage for high-performance workloads. Premium storage is based on SSDs, while standard storage uses rotational HDDs. Premium storage allocation is flexible; you can define multiple disks per VM and allocate up to 32 TB of premium storage to a single VM. Premium storage can achieve up to 50,000 IOPS per VM with extremely low latency, especially for read operations. Google offers three different storage options. Cloud Datastore is a managed, NoSQL schema-less database for storing non-relational data. For database storage, Google offers a fully managed MySQL database. For more generalized storage, Google offers Cloud Storage, which is essentially object storage that can be managed programmatically through an available API. Rackspace provides two main storage options: No Spinning Disks and Cloud Block Storage. As the name implies, the No Spinning Disks option is a pure SSD storage solution, and is available for VMs and bare-metal cloud servers. Cloud Block Storage, on the other hand, is available only for virtual servers. Page 24 of 27
26 public s Cloud Block Storage can consist of SSD or spinning disks, and can be connected to VMs via a 10 Gbps connection. 7. Regional support Sometimes business or regulatory requirements mandate hosting resources in a specific geographic region. That being the case, a should ideally give its customers a choice of where VMs will be hosted. AWS allows VM instances to be hosted in specific regions. It also designates various Availability Zones within those regions that are far enough apart from one another to be insulated against disasters. Google allows you to choose the regions where your VMs are hosted. However, there are some hardware differences between the various regions, and each has multiple zones. Google's available regions include locations in the U.S., Ireland, Germany, South America and Asia. Some resources, such as VM images, are not region-specific. Microsoft has defined 17 different regions for Azure, including locations throughout the U.S., Europe, Asia, South America and Australia. Page 25 of 27
27 public s Rackspace has cloud data centers in the U.S., London, Hong Kong and Sydney, Australia. The company uses these data centers to provide redundancy and guaranteed uptime. Rackspace does not offer the ability to confine a VM to a specific region. Going with the right public can make all the difference in providing an effective extension to your on-premises data center. Examining prices and features may be difficult, so make sure you put together a solid RFP to compare apples to apples and select the right service for your environment and business needs. This e-guide is made available to you, our member, through PRO+ Offers a collection of free publications, training and special opportunities specifically gathered from our partners and across our network of sites. PRO+ Offers is a free benefit only available to members of the TechTarget network of sites. Page 26 of 27
28 public s Take full advantage of your membership by visiting Images; Fotalia 2015 TechTarget. No part of this publication may be transmitted or reproduced in any form or by any means without written permission from the publisher. Page 27 of 27
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