> so around 3000 iops by node, I hope It'll improve in time. >>Yes at least it scales. Sadly only 3000 iops... but each node has a
>>capacity of 360.000 iops... perhaps a bit overkill... but SSDs are near >>cheap as SAS drives... So, If you launch fio from differents kvm guest on differents kvm host, you are limited by the ceph cluster speed ? ----- Mail original ----- De: "Stefan Priebe" <[email protected]> À: "Alexandre DERUMIER" <[email protected]> Cc: [email protected], "Dietmar Maurer" <[email protected]> Envoyé: Lundi 12 Novembre 2012 23:37:14 Objet: Re: [pve-devel] less cores more iops / speed Am 09.11.2012 15:43, schrieb Alexandre DERUMIER: >>> To me yes. With 3 Nodes i had a max of 10.000 iops. > > Ah, great to known ! > > so around 3000 iops by node, I hope It'll improve in time. Yes at least it scales. Sadly only 3000 iops... but each node has a capacity of 360.000 iops... perhaps a bit overkill... but SSDs are near cheap as SAS drives... > Did you have tested with gigabit link with bigger latencies ? No. But i hope i can compare Arista 10G against HP 10G soon. Stefan > ----- Mail original ----- > > De: "Stefan Priebe - Profihost AG" <[email protected]> > À: "Alexandre DERUMIER" <[email protected]> > Cc: [email protected], "Dietmar Maurer" <[email protected]> > Envoyé: Vendredi 9 Novembre 2012 15:28:12 > Objet: Re: [pve-devel] less cores more iops / speed > > Am 09.11.2012 11:31, schrieb Alexandre DERUMIER: >>>> Yes. CPU Load in Ceph for rand. 4k writes can be dropped by 50% when >>>> disabling all debug setting (see my last post on ceph mailinglist). >> >> I just see it, great,I'll test it on my side :) >> >> (how many ssds - nodes ?) I hope that Intank is working on random io >> performance. > I have 5 nodes with 4 SSDs each. > >> I don't understand why we can't get more iops, if they are no cpu or disks >> bottleneck... (or they are locks somewhere ....) >> >> I really would like to known if iops scale with the number of nodes... > > To me yes. With 3 Nodes i had a max of 10.000 iops. > > Stefan >
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