Comments on: Mount and HAMMER2 labels

By: Newnix

Newnix — Sun, 16 Apr 2017 13:13:14 +0000

Wormus, I wasn’t aware of the limitations of ZFS in regards to distributed computing, but I suppose it makes sense.

That said, any updates on H2 is welcome and exciting in my book, as much as I’d love for it to be in a usable state by the end of this year, so long as it’s not abandoned (which doesn’t seem likely) I’ll keep installing DragonFly on my systems, and trying to get competent enough to contribute in whatever way I can.

By: Wormus

Wormus — Fri, 14 Apr 2017 05:43:24 +0000

To be fair, it is a very difficult project. ZFS had two fulltime developers and the massive resources of a major corporation and it took what 6(?) years before it was integrated into Solaris. So its a fair bit of work for something as complex as H2.

I think people are also underestimating the importance of H2 for *BSD in general. ZFS is already starting to show its limits in an age of distributed cloud computing. H2 picks up and launches *BSD into a rapidly growing area of computing. Most of the shiny new filesystems are Linux-based (GPL) thus *BSD won’t be getting them anytime soon. Without H2 *BSD general will stagnate with inadequate filesystem options. ZFS isn’t even really a selling point for FreeBSD anymore since most of the commits now are coming from Linux developers for Linux integration.

So, with that, we definitely do need to encourage in whatever way possible H2 development.

By: Justin Sherrill

Justin Sherrill — Thu, 13 Apr 2017 22:44:05 +0000

Nick, I think what you are saying is that you want it out this calendar year. I think Hammer is interesting no matter the timeframe; the questions it answers are not tied to 2017.

This is an open source project, so work follows based on time and interest from the people doing it.

By: Nick

Nick — Thu, 13 Apr 2017 18:20:35 +0000

My person opinion is that if hammer2 doesn’t come out this calendar year – everyone will completely lose interest in dragonflybsd

By: Wormus

Wormus — Thu, 13 Apr 2017 15:22:30 +0000

Hi Anonymous,

I didn’t mean to usher in sadness : (

In addition to the 2016 document there are some additional git logs detailing H2 updates. So I am guessing that the document is due for an update. But yeah if it takes another five years to even be able to give the major features a good test run (even if not ready), people might loose interest altogether.

By: Anonymous

Anonymous — Thu, 13 Apr 2017 14:25:27 +0000

Wormus

That’s depressing.

In one years time been v3 and v4 of the docs linked above, only 1 of 16 components was completed (deduper).

And even that item isn’t completed fully.

There’s still 9 components left to complete for hammer2.

At this rate, it’ll be another 9 years before hammer2 is completed.

By: Wormus

Wormus — Thu, 13 Apr 2017 03:41:13 +0000

Adam there is a more recent design document:

https://gitweb.dragonflybsd.org/dragonfly.git/blob_plain/HEAD:/sys/vfs/hammer2/DESIGN

Judging from that it looks like its about 30% done. What seems unclear is at what stage it would be “functional”…50%? 70%?

By: Adam

Adam — Wed, 12 Apr 2017 22:24:29 +0000

An even better question on hammer2 is – does a bullet list of what’s been completed and what remaining exist?

Last piece of meaning hammer2 information I can find is from 2 years ago linked below

https://gitweb.dragonflybsd.org/dragonfly.git/blob/b93cc2e0815ec1ad6d6f8e60cc0becbdee247679:/sys/vfs/hammer2/DESIGN

By: Anonymous

Anonymous — Wed, 12 Apr 2017 21:51:24 +0000

What percentage complete is hammer2 development?

50%, 75%, 95%?