Free vSphere 6.5 Host Resources Deep Dive E-Book

In June of this year, Niels and I published the vSphere 6.5 Host Resources Deep Dive, and the community was buzzing. Twitter exploded, and many community members provided rave reviews. This excitement caught Rubriks attention, and they decided to support the community by giving away 2000 free copies of the printed … [Read more...]

vSphere and iSCSI storage best practices

Advertise here with BSAAnd here’s the next paper I updated. This time it is the iSCSI storage best practices for vSphere. It seems that we have now overhauled most of the core storage white papers. You can find them all under core storage on, but for your convenience I will post the iSCSI … [Read more...]

New whitepaper available: vSphere Metro Storage Cluster Recommended Practices (6.5 update)

Advertise here with BSAI had many requests for an updated version of this paper, so the past couple of weeks I have been working hard. The paper was outdated as it was last updated around the vSphere 6.0 timeframe, and it was only a minor update. I looked at every single section and added in new statements and guidance … [Read more...]

Deploy an OVA/OVF fails with certificate error

When trying to deploy an OVA/OVF with the vSphere Web Client the following error is displayed: The operation failed for an undetermined reason. Typically this problem occurs due to certificates that the browser does not trust. If you are using self-signed or custom certificates, open the URL below in a new browser tab … [Read more...]

Permit Project Management access only in vROps

Another interesting case in customizing vROps. I received a question from a customer who wanted to permit vROps project management feature access for a specific group of users in the Active Directory. All other vROps dashboards, views, features etc. should be disabled or not visible. To achieve this, you need to create … [Read more...]

VMware: How to reset the lost or forgotten root password in vCenter Server Appliance 6.5

To reset the lost forgotten root password in vCenter Server Appliance 6.5: Take a snapshot or backup of the vCenter Server Appliance 6.5 before proceeding. (Do not skip this step.) Reboot the vCenter Server Appliance 6.5. After the OS starts, loading the Photon splash press e key to enter the GNU GRUB Edit Menu. Locate … [Read more...]

VMware: vCenter 6.5 – warning message: RBD Health Alarm

This monitor tracks the vCenter RBD (vSphere Auto Deploy) Health Alarm. By default, the alarm is triggered by the following event: vim.event.HealthStatusChangedEvent: Health status of the Sphere Auto Deploy Waiter changed. For instructions on troubleshooting the Sphere Auto Deploy Waiter, see this VMware KB … [Read more...]

The difference between an isolation and a partition with vSphere

Advertise here with BSAI have a lot of discussions with customers on the topic of stretched clusters, but also regular vSphere clusters. Something that often comes up is the discussion around what happens in an isolation or partition scenario. Fairly often customers (but also VMware employees) use those words … [Read more...]

What if the VM Memory Config Exceeds the Memory Capacity of the Physical NUMA Node?

This week I had the pleasure to talk to a customer about NUMA use-cases and a very interesting config came up. They have a VM with a particular memory configuration that exceeds the ESXi host NUMA node memory configuration. This scenario is covered in the vSphere 6.5 Host Resources Deep Dive, excerpt below. Memory … [Read more...]

A vSphere Focused Guide to the Intel Xeon Scalable Family – Memory Subsystem

The Intel Xeon Scalable Family introduces a new platform (Purley). The most prominent change regarding system design is the memory subsystem. More Memory Bandwidth and Consistency in Speed The new memory subsystem supports the same number of DIMMs per CPU as the previous models. However, it’s wider and less … [Read more...]