While working with a VMware ESXi 8.0 Update 3 testing environment, I encountered an issue where the vCenter Server Appliance (VCSA) repeatedly crashed without an obvious root cause. Attempts to power off the appliance failed with disk-related errors, and although the VM could be forcefully restarted, the problem reappeared after a short period of time.

At first glance, the ESXi host appeared to be running out of disk space, despite being provisioned with a 150 GB disk. This raised an important question: where had the space gone? As it turned out, the root cause was not excessive data growth, but rather unallocated disk space that had never been added to the VMFS datastore.

In this post, I walk through the investigation process, explain how to identify unallocated space on an ESXi host, and demonstrate how to safely extend a VMFS datastore to recover the missing capacity and prevent future outages.

Most CloudStack users settle for local storage or NFS in production. Local storage locks VMs to specific hosts, while NFS often becomes a performance bottleneck. There’s a better way: SAN storage.

In Part 1, we’ll build an iSCSI SAN that combines the best of both worlds—shared access without the single-point bottlenecks, giving you true cloud flexibility without compromise.

deSEC.io is a completely free, privacy-focused DNS hosting service that provides enterprise-grade features including DNSSEC, ACME integration for Let’s Encrypt certificates, and a comprehensive REST API.

This article introduces how to migrate a domain to deSEC.io.

Ubuntu Minimal Cloud Images are official Ubuntu images and are pre-installed disk images that have been customized by Ubuntu engineering to have a small runtime footprint in order to increase workload density in environments where humans are not expected to log in.

This article introduces how to create Ubuntu cloud images for testing on VMware and XenServer, other than KVM.

System VMs (Secondary Storage VM and Console Proxy VM) and Virtual Routers play key role in Apache CloudStack. If user want to apply a change on the system vms and VRs, they do not need to wait for next release with the fix, they can patch the VMs. This article describes the steps how to apply a patch to a system vm or a VR.