Am 13.11.2012 09:01, schrieb Alexandre DERUMIER:
Ok, I hope Intank will look at librbd and find the bottleneck !
I hope that too. Sadly i'm not able to produce a callgraph with google
profiler as the kvm proces just segfaults when it is loaded.
----- Mail original -----
De: "Stefan Priebe" <s.pri...@profihost.ag>
À: "Alexandre DERUMIER" <aderum...@odiso.com>
Cc: pve-devel@pve.proxmox.com, "Dietmar Maurer" <diet...@proxmox.com>
Envoyé: Mardi 13 Novembre 2012 08:59:41
Objet: Re: [pve-devel] less cores more iops / speed
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.pri...@profihost.ag>
À: "Alexandre DERUMIER" <aderum...@odiso.com>
Cc: pve-devel@pve.proxmox.com, "Dietmar Maurer" <diet...@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.pri...@profihost.ag>
À: "Alexandre DERUMIER" <aderum...@odiso.com>
Cc: pve-devel@pve.proxmox.com, "Dietmar Maurer" <diet...@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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