<# PowerCLI - vSphere Full Monitoring Automation File: PowerCLI - vSphere Full Monitoring Automation.ps1 Purpose: Complete, production-ready PowerCLI automation script collection for comprehensive vSphere monitoring. Author: Sathyay2k Date: 2025-10-28 Contents: 1. Prerequisites and secure credential storage 2. Configuration section (variables) 3. Helper functions (connect, logging, email, push to ELK/Influx) 4. Data collectors: - Inventory (VMs, Hosts, Datastores, Network

Part III Scenario 61: VM Network Adapter Type Mismatch Leading to Throughput & Latency Issues In a virtualised environment, several Windows and Linux VMs were upgraded from older hardware generations. However, their virtual network adapters remained at legacy types (e.g., E1000 instead of VMXNET3). Over time, network-intensive applications (like database replication, file transfers) began showing higher latency and reduced throughput compared to peers. The virtualization blog

What Is SRM? VMware Site Recovery Manager is an enterprise-grade disaster recovery orchestration tool. It automates the planning, testing, failover, and failback  of virtual machine workloads between two vCenter-managed sites: a primary (protected) site and a secondary (recovery) site   Core Components and Architecture vCenter & SRM Servers at Each Site : SRM runs alongside vCenter on both the protected and recovery sites (as appliances), coordinating actions during recovery

Part II Scenario 31: DNS & Name-Resolution Failures in vSphere Infrastructure An enterprise virtualization environment running VMware vSphere began experiencing intermittent host disconnects, failed migrations, and sporadic management-UI issues. On investigation the root cause was found to be DNS misconfigurations — missing reverse lookup zones, outdated A/AAAA records, and inconsistent FQDN usage between the vCenter, ESXi hosts, storage arrays and switches. Symptoms: Some ES

What Is  Cloud Director Availability (VCDA)?   VCDA is a Disaster Recovery-as-a-Service (DRaaS) solution provided through 's Partner Connect ecosystem. It empowers tenants and cloud providers to replicate, migrate, fail over, and reverse failover vApps and VMs between on-premises vCenter and cloud environments, or between Cloud Director sites—supporting both migration and disaster recovery workflows.   Key operations include:   Onboarding and migration: Facilitates seamless m

Key Log Files & What They Cover Log File Location Purpose / Common Use vmkernel.log ESXi host: /var/log/vmkernel.log  Nakivo+2vStack+2 Core VMkernel activities: drivers, storage paths, network, device discovery. Use when host-level hardware / I/O / performance issues. vmkwarning.log ESXi host: /var/log/vmkwarning.log  Nakivo Warnings issued by VMkernel. Good early-warning log. hostd.log ESXi host: /var/log/hostd.log  Nakivo+1 ESXi host management service (hostd): VM power ope

1. vSphere / ESXi / vCenter Q1. What happens internally during a vMotion? Answer: - vCenter coordinates source and destination hosts.- Memory pre-copy begins while the VM continues running.- Dirty pages are tracked and copied in iterative passes.- VM is stunned briefly for final sync, then resumed on the destination host.- Inventory metadata and networking details are updated. Q2. What is EVC and how does it work? EVC (Enhanced vMotion Compatibility) masks CPU features to exp

1. vCenter & ESXi Issues SI No Issue Root Cause Fix 1 ESXi host not entering Maintenance Mode NSX-T VIFs still attached to VMkernel ports esxcli network vm list → identify pinned VMs → detach VIFs using nsxcli or API 2 vCenter login fails post-upgrade vmdir or STS token expiration Restart vmdird and STS service → service-control --restart vmware-stsd vmware-vmdird 3 Host disconnected in vCenter Management network unreachable / hostd service hung Restart management agents: /et

Here is a practitioner-focused, end-to-end Linux administration guide  aimed at experienced system administrators and SREs. It emphasizes commands, checklists, and “what to do when things go wrong” (failure-mode thinking), rather than deep theory. It’s distro-agnostic with examples primarily for both Debian/Ubuntu and RHEL/Rocky/Alma families, and call-outs when behaviour differs. Table of Contents 1. Foundations: Layout, permissions, and must‑know commands 2. Boot & Recovery