HAMMER is really good. ive been using it for about a year now and never got any corruption. the reblocker/pruner was initially an IO hog for about 5 minutes at 3am, but that has been fixed. Its totally smooth now. We use Solaris + ZFS + time slider on a storage server at work, and quite frankly, HAMMER has, even at its infancy worked better for me. HAMMER can now extend the file system on the fly, and I expect a file system shrink feature to be ready by the next release. From reading the mailing list it shouldnt be very difficult thing to do, thanks to the reblocker.

The goals of Dragonfly have been so interesting, but I hope this isn't another HURD situation (where HURD is also a really awesome project that progresses in babysteps).

Have any of you tried it? I haven't played around with it, but it is supposed to be pretty good.

Can't get it to run in VirtualBox on an MBP.

I think qemu works better for bsds you might try that

i'm anxious to see hammer stabilize and get ported to other operating systems.

I've given a quick shot to the previous release. Hammer seems stable, after some days of moderate use. It has nice features too, but it requires a "pruner/reblocker" cron job once in a while that might impact performance on a busy machine.

I'm more curious as to how the latest release scales to multiple processors, given the additional MPSAFE advances they made.