mdadm quick reference

Yes, Linux’ software raid tools could easily be swapped for zfs these days. I still have one array left, and as disks grow old, IOerrors starts to occure. Here are some commands I’ve found useful.

cat /proc/mdstat
mdadm --examine /dev/sdb1
mdadm --examine --scan
mdadm --assemble --scan
smartctl -a /dev/sdx
df -h | egrep -v '(overlay|shm|tmpfs)'

And about rsync:

A trailing slash on the source changes this behavior to avoid creating an additional directory level at the destination.

ddrescue comes from the package gddrescue

This work by Fredrik Wendt is licensed under CC by-sa.