After the addition of a hard disc to a mirrored zfs rpool, the boot process immediately stopped with the GRUB message: "bad pbr sig". It means that something is wrong with the Primary Boot Record (aka Master Boot Record). The solution was simple - I swapped the boot order of the hard discs in BIOS. Now it works perfectly again.
Cloudy Jakarta EE and MicroProfile: Microservices, Clouds and Beyond Jakarta EE / MicroProfile airhacks workshops at MUC airport, Winter Edition
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