What is DaaS and Why Should You Care?

At the end of blog 2, I suggested that—although it doesn't get you out of doing the necessary homework entirely—DaaS provides an alternative way to address VDI use cases, and it also unlocks new use-cases. For many companies, DaaS is simply a better fit than VDI or a complementary technology that can better address specific needs. Read more about the benefits of DaaS.

Designing, building, running, and maintaining VDI in-house can be challenging due to constraints that may include skills, datacenter space, budget limitations, and staffing. IT teams may already be oversubscribed. Finding and retaining experienced administrators with the skills to run a modern—but also complex—VDI platform can be difficult. Adding VDI to your existing mix of applications and services may just multiply your challenges.

Why choose DaaS​

Here are some of the reasons you might choose DaaS for some or all of your needs:

• Accelerate delivery of virtual applications and desktops to users leveraging public cloud infrastructure in single or multiple cloud regions.
• Support hybrid cloud deployments with virtual applications and desktops running on-premises or in public clouds, all managed from a single control plane.
• Address the needs of temporary, seasonal, and contract workers
• Reduce capital costs(CapEx)/switch to a pay-as-you-go (OpEx) model
• Eliminate the need for VDI infrastructure deployment and management

Many companies also find that DaaS give them greater flexibility and agility to:

• Support new business initiatives more quickly
• “SaaSify” classic Windows applications, by enabling them to be run from a browser
• Support a strategic transition to cloud services and run virtual applications and desktops closer to the data
• Enable users to move to Chromebook and Google Enterprise and run Windows apps in a cloud-native fashion
• Make VDI simple. Focus on applications and data, not the platform that supports their delivery

Before you can make an informed decision about DaaS, you'll want to know more about it.

What is DaaS in cloud computing?​

DaaS provides many of the same capabilities and advantages as VDI for end-user: anywhere access to applications and desktops, no data on the end-point, and centralized management. However, rather than design, procure, deploy, and manage all the necessary hardware and VDI software yourself, with DaaS you contract with a vendor who develops and operates the platform to satisfy your virtual desktop and application needs.

It's an easy mistake to assume that once you choose your DaaS provider, there's no work left for your team to do. However, in most cases that's not completely correct. Your IT team or IT partner will still be responsible for configuring, supporting, and maintaining the user workspace, including the applications that your end-users will have access to. This is illustrated in the figure below. I'll discuss the three layers of this figure from top to bottom.

Software-Defined Workspace Layer​

I'm starting at the top, because the top layer is the one you're directly responsible for. If you think about this for a moment, it makes sense that you have to be responsible for defining and managing the workspaces and the applications that your end-users will access, so you can ensure that they have access to the set of applications they need—whether that's commercial software or in-house applications.

The virtual workspace includes the Windows user profile and application settings—all configured and managed centrally. Applications are installed and published within the workspace using central image management solutions. These applications often require connections to other back-end systems like web services, database services, and file services to function correctly, so integration between the workspace and back-end services from both an identity management and networking perspective is an important element of the solution.

Desktop-as-a-Service Layer​

The next layer down contains the primary thing that differentiates VDI vs. DaaS: where the control plane, usually referred to as the broker, runs. The broker software, delivered as a service, handles the necessary access provisioning, security, and management functions in a virtual desktop or application environment. It helps to ensure that users are connected with the appropriate desktops and applications running on the appropriate infrastructure which can be in public clouds or on-premises.

The broker may connect with existing identity providers such as Okta, Google, or AzureAD, and it interacts with virtual infrastructure on-premises or in public clouds to power on/off, create/delete, and reboot the workload VMs that run end-user applications. The broker is also responsible for secure role-based access control and gateway services to deliver secure access to virtual applications and desktops via a launchpad, web interface, or APIs. With VDI, the broker and its supporting services runs in your datacenter (or co-location) and is entirely your responsibility. With DaaS, the broker is a managed service running in the cloud. A vendor, such as Nutanix, helps ensure that the broker and any associated services are up to date (often it is updated with new functionality weekly) and meet the agreed-upon SLAs.

By taking over responsibility for the broker, the DaaS provider offloads these responsibilities from your team, supporting new use cases and making life easier.

You need to evaluate the capabilities and options that each potential DaaS provider offers carefully before deciding which one to use. Here are a few important considerations:

• Cloud Native or Cloud Naïve? Is the DaaS solution born and designed as a cloud service or did it start as a software solution that was transformed to a service?
• Single cloud or multi-cloud? There are a variety of reasons you may want or need to support DaaS in different cloud environments, including avoiding lock-in.
• Utilize on-premises infrastructure? As discussed in the following section, you may want the broker to be a managed cloud service, while user desktops and applications run on-premises, possibly on infrastructure you own.
• Which desktop operating systems are supported? (Windows and/or Linux.)
• What's the user experience in both WAN and LAN environments? What is the performance when using an HTML5 browser to run virtual apps and desktops?
• Subscription and other service options?
  • Pay as you go? Named and/or concurrent users?
  • Does the DaaS solution support virtualized desktops and/or virtualized applications?
  • Are persistent (dedicated) or non-persistent (pooled) desktops supported?
  • How does the solution handle core capabilities such as image management, capacity management, identity integration, personal cloud storage integration such as Onedrive, GoogleDrive or Dropbox?
  • What about analytics, billing, and APIs?
  • Is the solution really turn-key, simple to setup and to support or are 5 day training course, scripting skills and 3rd party tools required?

Infrastructure-as-a-Service (IaaS) Layer All the end-user virtual application and desktop sessions will run on workload machines. These Virtual Machines may run on datacenter infrastructure, for example Nutanix HCI, or on IaaS provided by Azure, AWS or GCP. You may not care where this is—but chances are you do care. Of course, there are pros and cons of using public cloud versus on-premises infrastructure.

Choose on-premises infrastructure:

• For predictable, consistent workloads
• To achieve fixed costs, pay for peak load 24x7
• When significant data is on-premises (for data locality)
• If there is no public cloud IaaS region near the end-users
• When no public cloud resources or capacity available
• If data must be on-premises for legal and/or regulatory reasons

Choose public cloud IaaS:

• For agility and fast access to resources
• To support variable, ‘bursty', or seasonal workloads to achieve a usage-based, pay as you go cost model
• When data is already in the cloud (data locality)
• To support a global workforce leveraging multiple cloud regions

Don't be a lemming; a cloud-first strategy doesn't mean cloud-only. The DaaS broker should be able to support hybrid cloud. Leverage a combination of public cloud and on-premises infrastructure where they make the best sense to address business needs.

Does DaaS Address VDI Challenges?​

Before I wrap up, let's go back to the three VDI challenges from blog 2 to see how DaaS stacks up:

• User experience. Assuming you've done your homework to understand what your user needs are, the right DaaS solution should be able to meet those needs—and to a large extent it's the provider who is responsible for day-to-day performance, not you.
• Complexity. The provider takes over the responsibility for operating and ensuring the availability of the broker, so any complexity becomes their problem. But, make sure you ask about the tools your team will use to configure desktops and applications.
• High or unpredictable costs. Modern DaaS offerings should give you a choice of what infrastructure to use to address your goals. If your goal is to move from CapEx to OpEx, DaaS + public cloud checks this box, and once you understand your DaaS provider's pricing model, costs should be predictable. A hybrid deployment can reduce your total costs assuming you already own the necessary infrastructure. DaaS + on-premises infrastructure requires modern infrastructure to control costs.

In the next blog in this series, I'll look at the pros and cons of VDI versus DaaS to help you zero in on the best solution for your organization.

Other Blogs in This Series​

1. Why Should You Care About VDI and Desktop-as-a-Service?
2. VDI Challenges and How to Solve Them
3. How Nutanix Solves the Top VDI Deployment Challenges