[pve-devel] less cores more iops / speed

Stefan Priebe s.priebe at profihost.ag
Tue Nov 13 08:59:41 CET 2012


Not sure which component limits the speed. There's no measurable 
component running at 100% CPU load. Or 100% network load...

Stefan

Am 13.11.2012 08:46, schrieb Alexandre DERUMIER:
>> 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" <s.priebe at profihost.ag>
> À: "Alexandre DERUMIER" <aderumier at odiso.com>
> Cc: pve-devel at pve.proxmox.com, "Dietmar Maurer" <dietmar at proxmox.com>
> 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" <s.priebe at profihost.ag>
>> À: "Alexandre DERUMIER" <aderumier at odiso.com>
>> Cc: pve-devel at pve.proxmox.com, "Dietmar Maurer" <dietmar at proxmox.com>
>> 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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