June 30, 2016 4:25 pm


By: jrecord

August 22, 2008 6:50 pm


Rollback SLES Online Updates with LVM Snapshots

Overview Configuration Prepare to Update Update the System Accept the Update Reject the Update Rollback from Disaster Conclusion Overview This document is offered as an alternative solution to Rollback SLES Online Updates with Software RAID1. If you have your system disk configured with Logical Volume Management (LVM), you can implement this solution as a way […]

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By: jrecord

April 11, 2008 1:37 pm


Rollback SLES Online Updates with Software RAID1

Overview Configuration Break the Mirror Update the Server Accept the Update Reject the Update Why this Works Testing Notes Conclusion Overview I have often been asked if you can rollback a SUSE Linux Enterprise Server (SLES) after applying an online system update. The answer effectively is no. SLES uses installed RPM packages to build its […]

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By: Fabian Herschel

January 25, 2008 9:07 am


How to Simulate Network Outages and Wrong-wired Network Environments for Xen DomUs

by Fabian Herschel Problem: For some situations you need to test system and software behaviour in special error cases like network outages. Clusters, also demo clusters, always have to be tested in case of failing network connections. Using XEN to run systems in domUs makes it hard just to “plug off” the network cable. […]

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By: jrecord

July 27, 2007 3:26 pm


Recovering a Lost LVM Volume Disk

Contents: Overview Server Configuration Disk Belonging to a Volume Group Removed Corrupted LVM Meta Data Disk Permanently Removed Conclusion Overview Logical Volume Management (LVM) provides a high level, flexible view of a server's disk storage. Though robust, problems can occur. The purpose of this document is to review the recovery process when a disk is […]

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