Tag Archives: Linux

How to re-add a dropped disk from a degraded MDADM array

We had an issue earlier today where a customer’s Ubutnu Server decided to stop working. It simply refused to boot into the OS, instead displaying the following: [3.958693] md/raid:md0: raid level 5 active with 4 out of 5 devices, algorithm 2 BusyBox v1.18.5 (Ubuntu 1:1.18.5-1ubuntu4.1) built-in shell (ash) Enter ‘help’ for a list of built-in…

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