direction criterium for synchronisation raid1

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Hello,
which is in raid1 the criterion for the direction of synchronisation? In case of disk-replacing or removing one mirror-leg (working actual on the other leg ) and add the same removed leg later, which has the old data now, again to the mirror?

How can I tell the system which mirrored partition is now the data-source without making the raid1 new or zero the superblock? Is the destination in every case the device in mdadm manage after the add ? Can I see the source or destination by a info like mdstat or superblock?

I cannot find the answers of this simple questions. It works by testing, but I feel better about my production-system and a later replace if I know it. The found examples describes only the replace of ascending order second drives.

Thank You,
Christina

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