[Gluster-users] Gluster v 3.3 with KVM and High Availability

[Brian Candler]

On Thu, Jul 12, 2012 at 03:40:14AM -0500, Mark Nipper wrote:
> On 12 Jul 2012, Brian Candler wrote:
> > And I forgot to add: since a KVM VM is a userland process anyway, I'd expect
> > a big performance gain when KVM gets the ability to talk to libglusterfs to
> > send its disk I/O directly, without going through a kernel mount (and hence
> > bypassing the kernel cache). It looks like this is being developed now:
> > http://lists.gnu.org/archive/html/qemu-devel/2012-06/msg01745.html
> > You can see the performance figures at the bottom of that post.
> 
> 	Something concerns me about those performance figures.
> If I'm reading them correctly, the normal fuse mount performance
> is about what I was seeing, 2-3MB.  And now bypassing everything,
> libglusterfs is still capping out a little under 20MB/s.

I read it as:

(aggrb)
- base 72.9MB/s
- fuse bypass (libglusterfs) 66.MB/s

(minb)
- base 18.2MB/s
- fuse bypass 16.6MB/s

(maxb)
- base 18.9MB/s
- fuse bypass 17.8MB/s

etc.