Hi,
Thanks for the advice
Brgds
-Message d'origine-
De : Sage Weil [mailto:s...@newdream.net]
Envoyé : mardi 17 novembre 2015 14:41
À : CHEVALIER Ghislain IMT/OLPS
Cc : ceph-devel@vger.kernel.org
Objet : Re: [CEPH] OSD daemons running with a large number of threads
On Tue, 17 Nov 2015, ghislain.cheval...@orange.com wrote:
> Hi,
>
> Context:
> Firefly 0.80.9
> Ubuntu 14.04.1
> Almost a production platform in an openstack environment
> 176 OSD (SAS and SSD), 2 crushmap-oriented storage classes , 8 servers
> in 2 rooms, 3 monitors on openstack controllers
> Usage: Rados Gateway for object service and RBD as back-end for Cinder
> and Glance
>
> Issue:
> We are currently running performances tests on this cluster before turning it
> to production.
> We created cinder volumes (attached to Ceph Back End) on virtual machines and
> we use FIO to stress the cluster.
> A very large number of threads are created per OSD daemon (about 1000).
This is normal. The init scripts set the max open files ulimit to a high value
(usually 4194304 to avoid any possibility of hitting it) but you may need to
set /proc/sys/kernel/pid_max to something big if your cluster is large.
sage
_
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