I have 21GB in ~/.bitcoin/blocks. I also have 23GB in ~/.armory/databases. Optimally, I'd like to leave the .bitcoin/* where they are, and point armory to them. I'm not sure if this is possible given that armory has an extra 2GB in that databases directory? Also, bitcoin calls these files ".dat"s, where armory calls them ".ldb"s. Nevertheless, I can't believe that we have to keep two copies of the chain. Can someone tell me how to get rid of one?
Thx/D
Unfortunately, right the answer is you can't. I believe etotheipi had to make a tradeoff between RAM use and hard drive use since the old version of Armory used so much RAM that it was unusable for most people. This is why I don't run Armory most of the time right now. But I'm thinking of buying a terabyte hard drive that later on to stick the blockchain and Armory's version of it on that drive so I just won't have to worry about space for a while.
Technically though, there is one way to get rid of it, if you're willing to downgrade to an old version of Armory. Use the old version of Armory, if you have enough RAM to use it without any problems. I believe the RAM intensive version of Armory is 0.86 or so. Unfortunately, I don't see a version of it on bitcoinarmory.com. I might still have the installer for it though, I'd be happy to check if you're interested.
Update: I do have an old version of the installer, my oldest installer is 0.88 which I think is early enough to be a RAM intensive version, despite what I said previously, but unfortunately it won't help you out, as it's a Windows installer. If anyone else wants it though, I'd be happy to send it over.