[ceph-users] Performance, and how much wiggle room there is with tunables
denke at denkesys.com
Fri Nov 10 08:31:21 PST 2017
So you are using a 40 / 100 gbit connection all the way to your client?
John's question is valid because 10 gbit = 1.25GB/s ... subtract some
ethernet, ip, tcp and protocol overhead take into account some
additional network factors and you are about there...
On 11/10/2017 05:10 PM, Robert Stanford wrote:
> The bandwidth of the network is much higher than that. The bandwidth
> I mentioned came from "rados bench" output, under the "Bandwidth
> (MB/sec)" row. I see from comparing mine to others online that mine
> is pretty good (relatively). But I'd like to get much more than that.
> Does "rados bench" show a near maximum of what a cluster can do? Or
> is it possible that I can tune it to get more bandwidth?
> On Fri, Nov 10, 2017 at 3:43 AM, John Spray <jspray at redhat.com
> <mailto:jspray at redhat.com>> wrote:
> On Fri, Nov 10, 2017 at 4:29 AM, Robert Stanford
> <rstanford8896 at gmail.com <mailto:rstanford8896 at gmail.com>> wrote:
> > In my cluster, rados bench shows about 1GB/s bandwidth. I've
> done some
> > tuning:
> > [osd]
> > osd op threads = 8
> > osd disk threads = 4
> > osd recovery max active = 7
> > I was hoping to get much better bandwidth. My network can
> handle it, and my
> > disks are pretty fast as well. Are there any major tunables I
> can play with
> > to increase what will be reported by "rados bench"? Am I pretty
> much stuck
> > around the bandwidth it reported?
> Are you sure your 1GB/s isn't just the NIC bandwidth limit of the
> client you're running rados bench from?
> > Thank you
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