Robert Howard wrote: > > It's a 128-bit file systems, but it has a maximum capacity of 16 > exabytes, which is 2^64. > > I wonder if those additional 64-bits are used to permit client-side > random asynchronous GUID identifiers instead of server-side > synchronous sequential integers. > yow! I couldn't find an answer (a more motivated person can look through the souce code), but I'll throw in another guess: A transaction # + address might hash to a physical location. That would make sense for the transaction model and snapshot system as you could find a block from an old version of the file, and would justify why they call it a 128-bit filesystem as it would in fact be able to house physically that much content...
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