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=== the /boot filesystem ===In the past the /boot filesystem must be used either without md support, or else with RAID1. With modern kernels the it is possible to load the MD support as a kernel module through the initramfs mechanism. This approach allows the /boot filesystem to be inside any RAID system without the need of a complex manual configuration. * In the past you couldn't put /boot inside the RAID array, now you can.So you have a couple options in order to have a setup where each drive can be bootable. One is to have a /boot partition on each drive, or the other involves having /boot within a RAID array.=== Mdadm ===The mdadm utility can be used to create and manage storage arrays.