VxRail Cluster Integrity and Resilience
Tue, 01 Nov 2022 13:30:05 -0000|
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This is the fourth article in a series introducing VxRail concepts.
Maintaining cluster integrity is an important task to ensure normal business operations. Some readers might not have a great understanding of what cluster integrity means, so let’s quickly define what we’re discussing. Cluster integrity describes a state where a cluster remains free of hardware and software errors. One of the primary challenges to maintaining cluster integrity is handling change through the cluster life cycle. It’s very likely that an administrator will need to make some kind of change—whether to address something minor, like a disk failure, or something more complex, like needing to add new hardware to a cluster. Software updates are a different kind of challenge. Each cluster node has drivers, firmware, an operating system, and the more elaborate VMware and VxRail system software, adding up to a considerable number of files to consider. VxRail helps make patching more holistic and successful.
The hardware life cycle
As a Dell Support specialist, I spoke with customers about many challenges, and one of the biggest was moving through the hardware lifecycle. For customers working in a nonclustered environment, hardware refreshes frequently come along with highly involved migrations. Administrators can create clusters from these nodes to better provision IT resources, but these clusters are made from off-the-shelf hardware that isn’t necessarily intended to work together. VxRail HCI system software simplifies scaling out drive additions.
Part of the VxRail advantage is the ability to provide administrators confidence while it facilitates change. Continuously Validated States help to achieve this by providing administrators with hardware choices they can select, knowing that their cluster’s current state was built to support that new hardware. For example, maybe you have a 3-node cluster and are ready to add nodes and expand it to a 5-node cluster, but a matching NIC isn’t available. Continuously Validated States define other NICs that will work without creating compatibility problems. Automation scripting, which is used at the time of adding the new nodes to the cluster, scans the network, identifies the available hosts, and orchestrates node assignment to the cluster. This allows customers to scale out a cluster quite easily.
Nodes can also be removed from a cluster with similar scripting. This scripting helps clusters make intergenerational migrations when used in conjunction with the node addition automation. Once the new-generation hosts arrive at the data center, they get added to the cluster with one wizard and can be removed with another to complete the life cycle move. However, VxRail also supports heterogeneous clusters. This would allow you to continue using the older cluster nodes as long as they are needed and comply with each of the cluster’s Continuously Validated States as the cluster progresses through the life cycle.
Continuing with our travel analogy from a previous blog in this series, if the update process is a vehicle, then each patch is a piece of cargo that an administrator has to worry about. These patches can quickly build up into backlogs for IT staff, even if only some of them need to be applied to clusters. VxRail life cycle management processes improve patch control by consolidating these independent release cycles into singular bundles that have confirmed compatibility between the new software packages. This helps promote cluster integrity by creating order among these patches. The patches are bundled up into VxRail releases that are made available to cluster owners within 30 days of VMware’s releases. IT staff can then use these resources to be more selective in the patching process and can think of these cycles as opportunities to add new features and functionality to clusters, as opposed to a task with no clearly defined benefit or purpose.
Maintaining cluster integrity means maintaining the stable and productive working state that businesses need nodes to be in. An HCI cluster built internally faces additional challenges maintaining this integrity, especially as software and hardware changes are needed in the environment. VxRail Continuously Validated States help to both broaden the viable hardware options and provide software patch control through update bundles that bake in the patches. Orchestration automation serves to control the cluster as patches are applied or when hardware changes, such as adding new nodes to the cluster, are made. The next article in this series will discuss serviceability and include topics like disk replacement, alerts and events, the overall support experience, and more!
Related Blog Posts
Empowering Cloud-based Multi-cluster Management Using VxRail with CloudIQ
Fri, 18 Aug 2023 23:01:25 -0000|
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In today's digital landscape, organizations across various industries are generating and accumulating amazing sums of data. To harness the potential of this explosive data growth, businesses heavily rely on cluster computing. Managing these clusters effectively is critical to optimizing performance and ensuring continuous operations. VxRail clusters provide massive amounts of automation right out-of-the-box, which helps administrators accomplish significantly more.
But as the number of clusters grows, a centralized management interface becomes more and more valuable. That’s why I wanted to talk to you about CloudIQ today and introduce three exciting new features:
- Support for 2-node and stretched vSAN clusters
- DPU monitoring
- Performance anomaly detection with historical seasonality
These advancements revolutionize cluster management because they offer enhanced efficiency, flexibility, and performance to meet the evolving needs of modern enterprises.
The evolution of cloud-based cluster management
Traditional on-premises cluster management frequently presents challenges with hardware maintenance, scalability issues, and costly infrastructure investments. Cluster management with CloudIQ has proved to be a game-changer, allowing businesses to centralize the management of hardware and infrastructure to a single cloud-based tool.
By combining VxRail automation with CloudIQ, enterprises can focus on optimizing their applications and workflows while more easily handling cluster provisioning, scaling, and maintenance. This paradigm shift not only improves resource allocation and utilization. It also enables organizations to adapt more quickly to dynamic workloads.
2-Node and stretched vSAN cluster support for CloudIQ
In response to diverse business needs, CloudIQ now supports two additional cluster deployment types: the 2-node and stretched vSAN clusters.
Traditionally, clusters required a minimum of three nodes to maintain high availability, because having an odd number of nodes helped avoid split-brain scenarios. However, 2-node clusters can also address this challenge and ensure fault tolerance and high availability.
2-node clusters use advanced quorum mechanisms, allowing them to make decisions efficiently despite the lack of a third node. The nodes in the cluster communicate with each other and decide on quorum, based on various factors like network connectivity, storage health, and other cluster components. This setup significantly reduces infrastructure costs and is ideal for small to medium-sized businesses that require robust cluster management without the expense of additional nodes. 2-node clusters populate in the same location in CloudIQ as the rest of your clusters. They can be found by selecting the Systems option under the Monitor tab. After you select Systems, select the HCI inventory option and your enrolled VxRail clusters will populate there.
Stretched vSAN clusters
Businesses often want to deploy clusters across multiple geographically distributed data centers to improve disaster recovery and enhance business continuity. Stretched VxRail clusters with vSAN provide an excellent solution by extending vSAN technology across multiple data centers.
Key benefits of stretched VxRail clusters with vSAN include:
- Disaster Recovery: By replicating data between data centers, these clusters protect against site-wide outages, ensuring that operations continue seamlessly in case of a data center failure.
- Load Balancing: Stretched clusters intelligently distribute workloads across different data centers, based on demand, to optimize resource utilization and performance.
- Data Locality: Organizations can maintain data locality to comply with regional data regulations and reduce data access latency for end-users across different geographical regions.
Data Processing Unit Reporting
In a clustered environment, data processing units (DPUs) can become critical for efficient resource management. DPUs are hardware accelerators designed to handle specific data processing tasks, like NSX and other tasks handled by the vSphere Distributed Services Engine, to enhance overall cluster performance for specific workloads.
The Data Processing Unit Reporting feature provides insight into the details of DPUs within the cluster. Cluster administrators can view the hardware information for each DPU, including: the host name of each server with a DPU, the model, the OS version running on the host, the slot the DPU is installed in, each DPU’s serial number, and their manufacturer.
Performance Anomaly Detection
Unanticipated performance fluctuations can significantly impact application responsiveness and overall user experience. To address this concern, CloudIQ now integrates Performance Anomaly Detection—an intelligent monitoring feature that proactively identifies performance issues as they develop.
How does Performance Anomaly Detection work?
This feature uses machine learning algorithms to establish baseline performance patterns for various cluster metrics, including CPU utilization, memory utilization, power consumption, and networking.
When configured, the system continuously monitors real-time performance metrics and compares them to the baseline.
When CloudIQ detects any deviations from the expected behavior, it can raise alerts, enabling administrators to investigate and rectify potential problems immediately. This proactive approach ensures that performance issues are addressed before they affect critical operations, reducing downtime and enhancing user satisfaction.
As the demand for efficient data processing and storage continues to grow, cloud-based cluster management becomes vital for modern enterprises. The introduction of 2-node and stretched vSAN cluster support, data processing unit reporting, and performance anomaly detection takes cluster management to new heights. By leveraging the cutting-edge features of CloudIQ with VxRail, business organizations can unlock unparalleled efficiency, scalability, and performance, gaining a competitive advantage in today's fast-paced digital landscape. Embracing cloud-based cluster management with CloudIQ and its new features will undoubtedly pave the way for a bright and productive future for organizations and industries of all sizes.
Author: Dylan Jackson
Optimize and Streamline Data Center Operations with VxRail
Fri, 31 Mar 2023 19:07:36 -0000|
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Winter will soon be coming to an end, and Spring will be right behind. More outdoor life will resume as the season of refreshment and renewal approaches. In that spirit, I want to reseed the VxRail field of knowledge. One of the most critical areas of improvement that VxRail offers is in lifecycle management; just like how an attentive gardener can improve a plant’s life and fruit output, so too can VxRail improve and enhance the lifecycle management of clusters. We’ll take a look at how VxRail accomplishes this objective within this blog and the linked videos.
VxRail Manager is an on-cluster virtual machine that makes cluster management more accessible than ever through VMware vCenter. Much like how the tractor transformed harvesting wheat, VxRail Manager transforms how we manage clusters. Both cases enable people to accomplish much more. This virtual machine enables VxRail functionality in customer environments, providing automation solutions built by our VxRail team and support for customer-built scripts through an API. We’ll discuss some of these automation features later in this blog. These features are update prechecks, cluster update cycles, compliance checks, and cluster expansion. These functions, as well as many, many others, are also available by API call, which enables customers to craft their own automation solutions in addition to what VxRail already provides. The automation features that VxRail comes included with, such as a cluster shutdown, are readily consumed within vCenter, eliminating the need for administrators to familiarize themselves with yet another interface.
Enhanced update prechecks
The first significant part of the VxRail HCI System Software we’ll cover in this blog is update prechecks. The VxRail update precheck massively assists administrators by helping to confirm that a cluster is healthy enough to upgrade. This precheck script performs hundreds of tasks, but, as an example, let’s focus on just a couple of them.
Updates can halt for a variety of reasons. For example, if a cluster has insufficient storage, the whole cluster will fail to update. If a node was left in maintenance mode, it would not update. By running the optional VxRail update precheck, these headaches can be avoided. To get a look at the precheck, check out the video to the right. Just like how a tractor will till a field to prepare it for more successful seeding, the precheck also helps prepare clusters for more successful upgrades. VxRail Manager identifies issues like storage availability with this check, but it doesn’t stop there. VxRail Manager then provides administrators with a solution recommendation through a link to a Dell Knowledge Base article. Running the precheck takes a fraction of the time an update requires and has the potential to save massive amounts of labor and time by avoiding problems both large and small. So, while the precheck is optional, I’d recommend running it before every update cycle. The ability to prevent most issues from taking root is one everyone can appreciate.
Prechecks aren’t the only improvement, however. Now that VxRail Manager has confirmed that our clusters are healthy, we would want to apply an update. This is where we discuss some of the most critical enhancements a VxRail solution provides.
Updating a traditional non VxRail cluster is a process with a significant number of steps. Administrators need to create baseline images for each cluster and add any drivers, firmware, or other vendor add-ons each time. The difference in VxRail comes with implementing what we’ve come to call “Continuously Validated States.” Continuously Validated States make the LCM experience so much better. This is done in several ways, the first of which is that it removes the need to create baselines and cluster profiles. A video overview of the update process is here to the left, but Continuously Validated States handles this process. The VxRail team assembles the majority of the components needed in an update cycle, requiring only devices like GPUs, Fibre Channel controllers, and additional VMware software components, like NSX-T, to be added to the update packages. This helps administrators save time and effort, but it also provides massive long-term stability benefits. VxRail doesn’t just throw a bunch of component updates into a zip file and call it a day. These update packages undergo extensive testing in a multimillion-dollar VxRail testing facility for over 100,000 hours to help clusters reach as high as 99.9999 percent uptime in some cases. Administrators can then use the update packages created by the VxRail team to move their clusters from one Continuously Validated State to the next, keeping their VxRail environment in a known-good, happy state as it moves through the cluster lifecycle.
The update packages created by VxRail can be used in two different ways. Clusters with Internet access can pull these files through the network using the Internet Update button in the UI. Air-gapped clusters can move between Continuously Validated States through the Offline Update option, which uses local bundle files downloaded from the Dell support site. Returning to our gardening and cultivation analogies, you can certainly till a plot with a garden hoe, but you can do much more much easier with a rotary tiller. Similarly, administrators can manage a DIY HCI environment manually, but it will be significantly more difficult.
If you’d like to know about the new VxRail 8.0.000 release, you can read an article on it on the Info Hub Blog page.
Confirming the cluster state
Update automation ensures that VxRail clusters remain in a Continuously Validated State during update cycles, but clusters spend most of their lives completing business operations. VxRail Manager includes a compliance checker tool that helps ensure that clusters continue to adhere to their Continuously Validated State and identify any installed versions that drift away from it. This check is available on demand within the update interface of the UI. The compliance checker tool examines each node in a cluster, collects the current version set, and then displays the output in a way that calls out problem items specifically. When you consider that a significant part of the value that VxRail brings to the table is based on using and adhering to Continuously Validated States, it’s easy to see how helpful an automated inspection tool can be.
Easier and faster growth
Moving along, VxRail also enhances cluster growth. VxRail provides heterogeneous hardware support, which means customers can add different nodes as needed to best address their resource demands. As an example, this could be like adding different node models or even different hardware generations to a cluster. There are software improvements as well. When an administrator goes to add their new node or nodes, VxRail Manager scans the hosts available on the network for their software and firmware versions and confirm compatibility with the rest of the cluster. You can view the check in the video to the right, but it’s powered by the same concept behind VxRail updates, that being Continuously Validated States and the certainty their use provides. Clusters aren’t static environments—updates happen, and different versions in the environment could make compatibility checks a new hurdle! VxRail alleviates this pinch point with the use of the node image management tool. This tool, also known as NIM, is much like an enhanced Rapid Appliance Self-Recovery, or RASR, operation. Where a RASR will reimage a particular node with several steps, NIM allows for multiple node reimaging operations in parallel. The tool and instructions for its use can be found with SolVe online procedures.
Managing an HCI environment takes a lot of work with many tasks to accomplish. VxRail automates many of these tasks, particularly when it comes to lifecycle management. The automation enhancements don’t stop with what has been engineered into the software. VxRail also features an API that exposes the same calls and features used in the UI for script automation. Our API features over 100 calls, providing the toolkit necessary to create all kinds of special-purpose automation solutions. If VxRail is our tractor, the API toolkit helps customers create their own cultivators, levellers, hay bailers, and more! The precheck, updates, and compliance check enhancements we talked about earlier in this blog are all examples of actions that the API can take. As environments grow larger, management options need to grow with them. The VxRail API offers an expansive toolkit for developers to build the tools that businesses need.
Enhancing cluster lifecycle management and enabling administrators to manage more infrastructure are core parts of the VxRail offering. We covered how VxRail improves lifecycle management and empowers administrators with the update precheck that ensures clusters are ready to upgrade safely. We also covered the improved cluster update process with reduced labor time, compliance checks that ensure that cluster nodes adhere to their Continuously Validated States between upgrade cycles, and the cluster expansion tool with image control. The VxRail API can interface with these processes, enabling custom automation solutions within customer data centers. Just like how the humble tractor provided productivity that was previously unimaginable, VxRail provides the automation to maintain data centers more efficiently than ever. For more information about VxRail, visit the VxRail Info Hub.
Author: Dylan Jackson, Engineering Technologist