That seems to be mere happenstance. Using ext3 vs ext4 likely just slightly alters the exact IO pattern to cause a different number of md events. As long as the md event counter is not the same then adding the second modified disk back in causes a resync, destroying the changes specific to the second disk and going with the changes on the first detected disk.
-- booting out of sync RAID1 array fails with ext3 (comes up as already in sync) https://bugs.launchpad.net/bugs/557429 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
