> I have a fossil on an 18G hard drive, which from what I've seen, is > probably a much larger fossil than I need. However, I wasn't planning > on changing it unless it's really trivially easy to do so. I also have > another 18G drive and two 50G drives. I thought the thing to do would > be to mirror the 50G drives for venti arenas and that would leave the > 18G drive for isects (and bloom?).
Venti is much less sensitive to disk seek times than it once was. (See http://swtch.com/~rsc/papers/fndn/ and s/Foundation/Venti/g.) So to a first approximation, it basically doesn't matter what you do. Mirroring is a good idea; that's a good argument for putting the data on the 50G pair. You could also put the isect and bloom filter there, to keep the setup simple. You only need 5% = 2.5G for index; 18G is overkill. The bloom filter helps most when you are first initializing the venti, and for that it can be small (64MB is probably plenty). Russ
