Upgrade Dell EMC PowerFlex to v3.5.x This guide provides the upgrade procedures for PowerFlex components. A critical issue has been uncovered in the upgrade process from PowerFlex 3.0.x to PowerFlex 3.5.x for configurations with Fine Granularity (FG) storage pools. Customers with PowerFlex version 3.0.x and FG storage pools who wish to upgrade to PowerFlex version 3.5.x should contact Customer Support via a service request for upgrade guidance. Customers who have already upgraded to PowerFlex version 3.5 or 3.5.1 should contact Customer Support via SR for remediation to prevent the critical issue. Fresh deployments of PowerFlex version 3.5.x with FG storage pools are not affected. The following table lists the upgrade support matrix: Table 1. Upgrade support matrix ScaleIO / VxFlex OS base version Upgrade path Supporting documentation v18.104.22.168, 2.6.x Two-step upgrade flow: Upgrade to latest version of v3.0.1.x Upgrade to v3.5.1.x Upgrade VxFlex OS to v3.0.x Guide Upgrade PowerFlex to v3.5.x Guide v22.214.171.124 two-layer systems only, v3.0, v3.0.0.x, v3.0.1.x, v3.5, v3.5.1.x Single-step upgrade from VxFlex OS v126.96.36.199/v3.0/v3.0.0.x/v3.0.1.x or PowerFlex v3.5/v3.5.1.x to PowerFlex v3.5.1.x Upgrade PowerFlex v3.5.x Guide NOTE: On ESXi-based PowerFlex v3.0, or v3.0.0.x systems that contain CentOS 7.5-based SVMs, the CentOS operating system must be upgraded after upgrade of system components. NOTE: Upgrade of AMS managed PowerFlex systems to v3.5.x: AMS is not supported on PowerFlex v3.5 and future versions. For guidance on AMS removal and the option to move to PowerFlex Manager please reach out to PowerFlex Product Management. Child Topics Automated and manual upgrade of software components You can upgrade PowerFlex software components with automated tools, in a non-disruptive manner, or manually upgrade components. Upgrade limitations Check that you are aware of upgrade limitations before commencing the upgrade process. Parent topic Introduction Upgrade software and firmware components to the latest compatible versions, using automated and manual processes.