[Gluster-users] Throughout over infiniband
Stephan von Krawczynski
skraw at ithnet.com
Mon Sep 10 08:03:14 UTC 2012
On Mon, 10 Sep 2012 08:48:03 +0100
Brian Candler <B.Candler at pobox.com> wrote:
> On Sun, Sep 09, 2012 at 09:28:47PM +0100, Andrei Mikhailovsky wrote:
> > While trying to figure out the cause of the bottleneck i've realised
> > that the bottle neck is coming from the client side as running
> > concurrent test from two clients would give me about 650mb/s per each
> > client.
> Yes - so in workloads where you have many concurrent clients, this isn't a
> problem. It's only a problem if you have a single client doing a lot of
> sequential operations.
That is not correct for most cases. GlusterFS always has a problem on clients
with high workloads. This obviously derives from the fact that the FS is
userspace-based. If other userspace applications eat lots of cpu your FS comes
to a crawl.
> Have you tried doing exactly the same test but over NFS? I didn't see that
> in your posting (you only mentioned NFS in the context of KVM)
And as I said above NFS (kernel-version) does have no problem at all in these
And it does not have the GlusterFS-problems with multiple concurrent FS action
on the same client, too. Neither there is a problem with maximum bandwidth.
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