Recent Posts

Just-in-Time Capacity Provisioning with VMware vSAN

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A challenge with some traditional storage solutions is the inability to add incremental amounts of capacity. Due to a variety of requirements, policies, and constraints, many organizations will purchase a large quantity of storage capacity once every few years as they attempt to account for current and future demands. Purchasing all of that storage up Read more...

vSAN Degraded Device Handling

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Introduction While this blog article focuses more on availability, performance is certainly worth mentioning. A poorly performing application or platform can be the equivalent of being offline. For example, excessive latency (network, drive, etc.) can cause a database query to take much longer than normal. If an end-user expects query results in 30 seconds and Read more...

vSAN 6.7 in the HTML5 vSphere Client

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VMware is switching many of its solutions to a new HTML5 UI framework called Clarity Design System. As you might already know, this removes the dependency on Flash and provides a clean, modern look for managing a virtualized infrastructure. The user experience is the same using a modern web browser on most popular operating systems Read more...
What happens to vSAN when vCenter Server is offline?

What happens to vSAN when vCenter Server is offline?

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A commonly asked question is “What happens to vSAN when vCenter Server is offline?” The answer is simple: nothing. vSAN continues to operate normally and virtual machines continue to run. This article briefly discusses the impact to vSAN of vCenter Server being offline temporarily and the implications of a permanent loss of vCenter Server. Read more...
vSAN Operations: Add a Host or Fault Domain for Maintenance

vSAN Operations: Add a Host or Fault Domain for Maintenance

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Preparing a host for maintenance is quite simple in a vSphere cluster. With vSphere DRS enabled, you click a host in the vSphere Web Client, select Maintenance Mode, and click Enter Maintenance Mode. vSphere automatically migrates running virtual machines off of the host and places the host in maintenance mode. This effectively removes access to Read more...

vSAN Operations: Maintenance Mode – No Data Evacuation – Caution When PFTT=0

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VMware vSphere includes a feature called Maintenance Mode that is useful for planned downtime activities such as firmware updates, storage device replacement, and software patches. Assuming you have VMware vSphere Distributed Resource Scheduler (DRS) enabled (fully automated), Maintenance Mode will migrate virtual machines from the host entering maintenance mode to other hosts in the cluster. VMware Read more...

vSAN Operations: Maintain Slack Space for Storage Policy Changes

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vSAN “slack space” is simply free space that is set aside for operations such as host maintenance mode data evacuation, component rebuilds, rebalancing operations, and VM snapshots. Activities such as rebuilds and rebalancing can temporarily consume additional raw capacity. Host maintenance mode temporarily reduces the total amount of raw capacity a cluster has. This is Read more...

VMware vSAN 6.6 Deploy and Manage Training Class

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VMware Education has just released a new training class titled VMware vSAN: Deploy and Manage [V6.6]. I had the opportunity to attend the beta version of this class and help shape the content that is delivered. The class is a 3-day, instructor-led technical training course that features an excellent balance of lecture and hands-on lab time. It is Read more...

VMware vSAN 6.6 Licensing Guide

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VMware vSAN powers market-leading Hyper-Converged Infrastructure (HCI) solutions through native integration with the industry-standard VMware vSphere hypervisor and the VMware vCenter Server unified management solution. vSAN is quite capable of running nearly any virtual server and desktop workload. These workloads run in an ever-increasing number of environments: primary data centers, disaster recovery sites, remote offices, Read more...