freebsd vfs, solaris vfs, zfs

[Matthew Ahrens]

If you liked Andriy's article, you will probably also enjoy his talk on
this subject from the European OpenZFS Conference:

https://www.youtube.com/watch?v=oB-QDwVuBH4&index=8&list=PLaUVvul17xScyhIYmGjaNaGSWI49qyf6K

http://www.open-zfs.org/w/images/9/98/Andriy_-_FreeBSD_Dev_Talk.pdf

The video is much more detailed than the slides, so I'd encourage checking
it out.  If you only have 10 minutes, start around 16:30 for the "TL;DW".

The beginning of the video is about how they tested ZFS, the ZPL in
particular.  Around 12:00 he talks about several problems he discovered
with the FreeBSD ZFS code that were due to differences between illumos and
FreeBSD VFS.  Then around 20:00 he talks about how to fix the problems.

--matt


On Sat, Jun 7, 2014 at 10:52 AM, Jordan Hubbard <jkh at ixsystems.com> wrote:

>
> On Jun 7, 2014, at 8:08 AM, Fabian Keil <freebsd-listen at fabiankeil.de>
> wrote:
>
> > Andriy Gapon <avg at FreeBSD.org> wrote:
> >
> >> I've tried to express some of my understanding of how FreeBSD VFS works
> and how
> >> it compares to Solaris VFS model, maybe you would find that interesting:
> >>
> http://www.hybridcluster.com/blog/complexity-freebsd-vfs-using-zfs-example-part-2/
> >> I will certainly appreciate any feedback.
> >
> > I'm interested in articles like this, thanks for taking the time to
> write them.
>
> Yes, this is a well-written (albeit deeply technical) article on BSD VFS.
>  I get that the author is clearly more familiar with Solaris, and therefore
> used it as a point of comparison, but I wonder if he has any appetite for a
> Linux VFS (http://www.win.tue.nl/~aeb/linux/lk/lk-8.html) vs BSD VFS
> article as well.  I’ve never really investigated the Linux VFS
> implementation in any detail, but I’m told it has some nice features to
> facilitate file change monitoring and simply provides a richer set of
> semantics for permuting filesystem behaviors.  Maybe we could learn a thing
> or two from it?
>
> - Jordan
>
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