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Repairing a Linux host with disk/filesystem issues

This is a writeup on some scenario’s for disk issues that you could encounter when running linux systems. The linux systems I am talking about are centos/redhat/oracle (EL) version 7 systems. This is just a writeup for myself to know how to deal with different scenario’s, hopefully other people find this interesting too. I don’t believe there is any difference for the below scenario’s and resolutions between running physical/bare metal, virtualised or in the cloud, provided you can get access the you need (like the BIOS POST console). The test configuration uses (legacy) MBR (meaning non UEFI), grub2 as boot loader, LVM for meta devices (you don’t want to run without LVM!!) and XFS for the filesystems.