Writing
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The kernel ip= parameter: what each field actually does
What each field of the kernel ip= boot parameter actually does, with notes from setting it up for Dropbear-in-initramfs remote LUKS unlock
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The mdadm backup file: when it's needed, and when it isn't
A close look at what mdadm's --backup-file does during a RAID reshape: when it's required, when it's optional, and what happens if you lose it mid-operation.