Since my last comment, an updated kernel arrived via Update Manager.
Its changelog included the following:
* md: fix possible corruption of array metadata on shutdown.
- LP: #992038
This seems possibly relevant. I updated, and have now rebooted several
times. The RAID degradation is still happening, on every reboot. As
before, the system runs just fine after I finish fixing up RAID.
I am now keeping detailed notes on which partitions are being degraded.
Since it takes me anywhere from fifteen minutes to several hours to
accomplish each reboot and ensuing repair, and I have other things to do
as well, it will be a while before meaningful statistics are
accumulated.
Further details I forgot to mention earlier: This is an AMD64 system
with 8GB of ECC RAM. Have attached most recent dmesg.
** Attachment added: "dmesg.txt"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/990913/+attachment/3157872/+files/dmesg.txt
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https://bugs.launchpad.net/bugs/990913
Title:
RAID goes into degrade mode on every boot 12.04 LTS server
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