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When the machine came back up today, we noticed our /home directory had reverted to a state it was when this machine was first built.
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Are you meaning that you had mounted a partition to /home and now that partition no longer mounts so you have an empty /home directory? That would make sense if that partition was on part of the array that failed.
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At first glance, it appeared a drive in the array failed, and the mirror failed to rebuild the data properly.
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It should be fairly easy to see if a drive failed right? Just check /proc/mdstat and /var/log/messages. But what do you mean it failed to rebuild the data? It sounds like you didn't replace the broken drive yet, so how would you "rebuild the data?" Did removing the broken drive from the array not work?
Code:
# mdadm --manage /dev/md0 --fail /dev/sdb0
Is that not working? Maybe thats what you mean by
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Further investigation shows we have a controller that isn't responding to the kernel at all.
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What we might lose, is the website code. The forum code, all of our tools, editors, scripts, etc. It can be reconstructed, but it will be painful ... Misc internal scripts, PEQBot, and other such things that made my life easier may also be on the chopping block.
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If it does come to that, why don't you post a list of what you need and I'd be willing to try and get a couple of those items taken care of.
Thanks for all your work!