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RAID: mirrors, parity and degraded arrays

cheat sheet · Linux · md (mdadm 4.3) https://lab.dimsanych.ru/en/wiki/raid/

Cheat sheet

cat /proc/mdstat every array: [UU] or [U_]
sudo mdadm --detail /dev/md0 State: clean, degraded, recovering
lsblk disks and the array on top (raid1)
sudo dmesg | grep md/raid when and which disk dropped out