How to check if the mirroring has an issue? How to check the health of an LV which has mirror?
In case there are issues with the mirroring you can see the Stale PEs on the LV.
To see this you can use
lvdisplay -v <LV_Name> | grep -i stale
If mirror copies in lvdisplay is 1 and there are no stale extents you are good, your 1 way mirror is healthy.
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