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Thank you very much for the answer. I have tried removing the third member (2nd external) from the array now, and the now lonely external second disk syncs beautifuly, only the small unclean part of the array. Perfomance is ablolutely satisfying. The array holds the /home partition and I don't notice any lag with write behind. What a cool idea with the stacking of overlapping bitmaps. Looks like you produced the perfect solution I was looking for!

Hotpluging works nicely now, with some fixes to the distribution (only with arrays created on the particular system though). A good upstream improvement might only be an option not to restrict hotpluging only to matches with hostname/UUIDs listed in mdadm.conf, and this one, if it is valid: A "mdadm --incremental --run /dev/mdX" command to start only *selected* arrays (i.e. the rootfs after a timeout) degraded in "auto-read" mode. https://bugs.launchpad.net/ubuntu/+source/mdadm/+bug/251646

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