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Booting from an md RAID 1 device

(warning) When the root file system is on a RAID device, either directly or because it is an LV based on a RAID device for PV, to prevent boot hanging when the RAID is degraded:

  • Before Jessie (TODO: Trusty same?): use kenel parameter bootdegraded=true
  • Jessie (TODO: Trusty same?): create /etc/initramfs-tools/conf.d/mdadm containing "BOOT_DEGRADED=true" and rebuild the initrd with update-initramfs -u

When a RAID 1 md device is used for /boot, GRUB should be installed to both underlying devices, not to the md device.  This is done using

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