rebuild after reboot

Hi folks :-)

Yesterday I changed a fail disk, after complete recovery my raid was
perfectly. I rebooted my os and at start-up mdadm was again in recovery
mode (one disk fail)

Now I ask to myself, I have to do mdadm --examine --scan >>
/etc/mdadm/mdadm.conf everytimes I change a disk? or only when create a
new raid?

Why after reboot mdadm recovery again the array?

what is the problem?

thanks! :-)

Pol

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