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Rollback of Exalogic Patch Set Update (PSU) for Linux on Bare Metal (Physical Configuration) (Doc ID 2142240.1)

Last updated on NOVEMBER 14, 2022

Applies to:

Oracle Exalogic Elastic Cloud Software - Version and later
Linux x86-64


This document describes how to rollback the updates performed by an Exalogic Patch Set Update (PSU) on Exalogic X2-2, X3-2, X4-2 and X5-2 racks running Exalogic Elastic Cloud Software (EECS) 2.0.x with Linux on bare metal (physical configuration).

The rollback described in this document involves a lengthy manual procedure. Note that the rollback is disruptive and can take 1 - 3 days, depending on the size of the Exalogic rack. For these reasons, we recommend moving forward by implementing fixes or workarounds for critical issues in the upgraded environment. That is, rollback should be considered only as a last resort after exhausting all other options. 


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In this Document
 1. Rollback Pre-requisites
 2. High-level Overview of the Rollback Procedure
 3. Compute Node Rollback
 3.1 Disk Controller Rollback
 3.2 InfiniBand Card Rollback
 3.3 ILOM Rollback
 3.4 Operating System Rollback
 4. ZFS Storage Appliance Rollback
 4.1 ZFS ILOM Rollback
 4.2 ZFS InfiniBand Card Rollback
 4.3 ZFS Software Rollback
 5. NM2-36p Switch Rollback
 5.1 Downgrading to NM2-36p v2.1.6-2
 5.2 Downgrading to a version older than v2.1.6-2
 6. NM2-GW Switch Rollback
 6.1 Downgrading to NM2-GW v2.1.6-2
 6.2 Downgrading to a version older than v2.1.6-2

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