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you're not the first person to suggest that to me :) although I haven't thought about using ZFS for this. You're not the only one to suggest ZFS. Why that and not compression in btrfs (or something else entirely)?

_hopefully_ the mmap interface would provide the best of all worlds: mongodb continues to be simple with respect to how it handles getting data from disk and the kernel/fs can do it's magic behind the scenes of mmap. Of course, it could be that mmap + compressed filesystem leads to some unexpected (and bad) perf results. But then again, I've never tried :) have you?




No reason for ZFS in particular -- I was just unsure about how stable btrfs currently is. I haven't tried this out, but I think I might. Email's on the site in my profile if you beat me to it. :)

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