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Handling APD and PDL Errors in VMware vSphere: Understanding and Resolving All Paths Down and Permanent Device Loss

APD and PDL are two types of serious storage failures in VMware vSphere that present with similar symptoms but require completely different remediation approaches. This article walks through how to distinguish, diagnose, and resolve each condition using CLI and PowerCLI — based on real-world experience managing an 8-host ESXi cluster.