vVol migrations are easy to misread. When a VM migration fails, the first instinct is usually to look at host load, vMotion networking, datastore latency, DRS behavior, or the backend array. Those checks still matter, but vVols introduce another dependency that can become the bottleneck before the data path is the real problem: the VASA … Read more
Raw Device Mappings tend to show up in the places where infrastructure history is still attached to the workload. A database server was moved from physical hardware years ago. A file server needed a very large LUN before VMDK limits improved. A clustered application depended on shared storage. A storage team wanted array-level tooling to … Read more
Disable vCLS on a Cluster via Retreat Mode KB 316514 vSphere Cluster Services usually stay in the background until they get in the way of something operational. Most teams first notice vCLS when a cluster task is blocked, a warning appears after maintenance, or a handful of small system VMs show up and someone asks … Read more
There are storage incidents where the host looks half-recovered. The fabric switch is back online. The link light is good. The array port is healthy. Some paths may even show up again. But inside ESXi, the storage view still does not match reality. A datastore has fewer paths than expected. An RDM-backed workload is not … Read more
VLAN issues in VMware environments are rarely caused by one mysterious setting. More often, they come from a translation problem. The network team thinks in terms of access ports, trunks, allowed VLAN lists, native VLANs, port channels, and upstream gateways. The virtualization team thinks in terms of vSwitches, distributed port groups, VMkernel adapters, VM network … Read more
A vSphere Distributed Switch upgrade can look deceptively simple in the vCenter UI. Select the switch, choose the target version, confirm the warning, and move on. That is not how it should be treated in a brownfield environment. The risk is not that a DVS upgrade is always dangerous. The risk is that old distributed … Read more
Virtual machine network problems rarely arrive with a clean label. The ticket usually says something like “the VM is unreachable,” “the application cannot connect,” “ping fails,” “internet access is down,” or “VMs on different hosts cannot talk.” The underlying cause might be inside the guest OS, on the VM’s virtual NIC, in the port group, … Read more
Patching vCenter should not feel dramatic. The workflow in the Appliance Management Interface is straightforward: log in to VAMI, check for updates, stage, install, validate. Broadcom KB 316584 documents that basic path for vCenter Server 7.x and 8.x, including two patching options: using a URL-based repository or mounting a patch ISO as a local CD-ROM … Read more
You open the vSphere Client and instead of the inventory, you get a blunt message: Sometimes the symptom is more explicit. The login flow may fail with: Other times the vCenter Server Appliance looks partially alive from the outside, but core services will not come up after a reboot. In Broadcom KB316619, this pattern is … Read more
Storage failures in vSphere are rarely just “storage is down.” That phrase may be accurate from the application owner’s point of view, but it is not precise enough for the operator who has to decide what happens next. A host that has lost all paths to a datastore behaves differently from a host that has … Read more
Large VM migrations usually fail at the worst possible time: late in the change window, after the task has already consumed hours of storage, network, and operator attention. When the error is something like “Invalid configuration for device ‘##’,” the first instinct is to look for a broken virtual NIC, a missing port group, an … Read more
vCenter certificate failures tend to show up at the worst possible time: during an upgrade precheck, after a maintenance window has already started, when services will not start cleanly, or when a certificate alarm has been ignored long enough to become someone else’s emergency. The mistake is treating certificate recovery as a button-click exercise. The … Read more
Certificates in vSphere are easy to underestimate until they become the reason vCenter will not authenticate, services will not start cleanly, NSX loses trust in its Compute Manager, or SDDC Manager stops interacting with the management domain the way it should. That is why a VMCA reset should not be treated as a generic “renew … Read more
vCenter certificate problems rarely arrive as clean, isolated maintenance tasks. They usually show up as failed logins, services that refuse to start, upgrade prechecks that suddenly block progress, or downstream trust failures in NSX, SDDC Manager, backup tools, monitoring platforms, or automation. By the time an operator is searching for “Fixcerts,” the environment is often … Read more
VMware Cloud Foundation 9.1 is not the kind of upgrade you should treat as a last-minute lifecycle task. For many customers, the move to VCF 9.1 is also a shift in operating model, lifecycle sequencing, management services, resource planning, and cross-team readiness. That is why the new VCF 9.1 Upgrade Planning Tool matters. VMware’s announcement … Read more
TL;DR Architecture Diagram Table of Contents Scope and terminology guardrails You will move faster as an organization if you treat these as non-negotiable guardrails: For topology conversations, you also need consistent physical vocabulary: Assumptions Decision criteria Use these criteria to keep topology and identity debates grounded in operational outcomes: Challenge You need a topology and … Read more
TL;DR If you want architects, operators, and leadership aligned, you need a topology mental model that starts with VCF objects and only then maps to your physical sites. Architecture Diagram Table of Contents Scenario You are about to deploy VCF 9.0 GA greenfield and you need a shared language for: Scope and version alignment This … Read more
TL;DR Architecture Diagram Table of Contents Scope and Code Levels This article is written against VCF 9.0 GA terminology and design guidance. Version Compatibility Matrix Use this as your “shared truth” when people ask “what exactly are we talking about?” Component Version Build VMware Cloud Foundation 9.0 24755599 VCF Installer 9.0.1.0 24962180 ESX 9.0.0.0 24755229 … Read more
TL;DR If you want clean accountability in VCF 9.0, anchor your operating model to the official hierarchy: VCF private cloud -> VCF fleet -> VCF instance -> VCF domain -> vSphere clusters. This post translates that hierarchy into an operating model: who owns what, where day-0/day-1/day-2 work happens, and how topology (single site vs two … Read more
TL;DR Standardize on the official hierarchy: VCF private cloud -> VCF fleet -> VCF instance -> VCF domain -> vSphere clusters. A VCF fleet is managed by one set of fleet-level management components (notably VCF Operations and VCF Automation), while each VCF instance keeps its own management domain and domain-level control planes. Your fastest path … Read more
