ok i figured it out, my write logs within pool-0 were configured wrong.
they need to be:
+
--sda
--sdb (remote)
+
--sdc
--sdd (remote)
during the problem they were about
+
--sda
--sdb
+
--sdc (remote)
--sdd (remote)
the "bad change" was during replacement of hard drives. Now failover and moving nodes is working correctly.
BTW, this forum should be improved a lot. Dont you trust your own users or why upload of images is disabled/not possible, linking to outside images is made difficult, writing forum posts is only allowed if administrators approve the post?
I do see your images of the disk groups that are not links. The reason for the forum admin to approve is to prevent spam and other junk links. We had issues in the past and it is better controlled this way.