Re: [ceph-users] Ceph and low latency kernel

Hi, sorry it was a bit poorly defined. I'm talking about thinks like this: http://lwn.net/Articles/551179/ Stefan Am 25.05.2014 11:11, schrieb Andrey Korolyov: > Hi, > > which one you are talking about? -rt patchset has absolutely no > difference for Ceph, though very specific workload (which

[ceph-users] Ceph-deploy to deploy osds simultaneously

Hi, does ceph-deploy support to deploy osds simultaneously in a large scale cluster? Looks mkcephfs does not support simultaneous osd deployment. If there are many hosts with very large number and size of osds/devices, how do I improve the performance to deploy the whole cluster at once? Wei

[ceph-users] How to get Unique object ID of object in ceph

I am trying to explore the possibility to use ceph object based storage in software development and client side deployment.I configured Rados gateway.I am able to access data with filename reference using S3 API and various other s3 clients.I wish to use Object ID to access the data rather then fi

Re: [ceph-users] Expanding pg's of an erasure coded pool

On May 21, 2014, at 1:33 AM, Gregory Farnum wrote: > This failure means the messenger subsystem is trying to create a > thread and is getting an error code back — probably due to a process > or system thread limit that you can turn up with ulimit. > > This is happening because a replicated PG pr

Re: [ceph-users] Fwd: 70+ OSD are DOWN and not coming up

On Sun, 25 May 2014, Sage Weil wrote: > Hi Karan, > > Can you confirm that the next several map(s) (289569, 2895670, etc.) exist > on those OSDs? > > cd /var/lib/ceph/osd/ceph-58/current/meta > find . | grep 28957 Assuming those maps are in fact missing, then I see the bug. wip-map-advance

Re: [ceph-users] Fwd: 70+ OSD are DOWN and not coming up

Hi Karan, Can you confirm that the next several map(s) (289569, 2895670, etc.) exist on those OSDs? cd /var/lib/ceph/osd/ceph-58/current/meta find . | grep 28957 sage On Sun, 25 May 2014, Karan Singh wrote: > Hi > > This problem occurred somewhere between 16 - 18th May .  Before this clust

Re: [ceph-users] Designing a cluster with ceph and benchmark (ceph vs ext4)

On Sat, 24 May 2014 13:14:42 +0100 Pieter Koorts wrote: > If looking for a DRBD alternative and not wanting to use CephFS is it > not possible to just use something like OCFS2 or GFS on top of a RDB > block device and all worker nodes accessing it via GFS or OCFS2 > (obviously with write-through m

Re: [ceph-users] CephFS block size

Hi Jean,  Thanks for your answer. show_layout and set_layout can only show and set object size, stripe units, stripe counts, pool and probably primary osd. They are not related to the file system block size which should be adjusted before setting the file system layout. I need to change CephFS

Re: [ceph-users] Ceph and low latency kernel

Hi, which one you are talking about? -rt patchset has absolutely no difference for Ceph, though very specific workload (which I was unable to imagine at a time) can benefit of it a little. Windriver variant means much more, because it rt`ing virtualized envs - in combination with storage nodes you

Re: [ceph-users] Ceph and low latency kernel

I very briefly tried kernel-rt from RH MRG, and it didn't make any noticeable difference. Though I didn't spend any time tuning things. Cheers, Dan On May 25, 2014 11:04 AM, Stefan Priebe - Profihost AG wrote: Hi, has anybody ever tried to use a low latency kernel for ceph? Does it make any d

[ceph-users] Ceph and low latency kernel

Hi, has anybody ever tried to use a low latency kernel for ceph? Does it make any differences? Greets, Stefan ___ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com

Re: [ceph-users] CephFS block size

Hi Sherry go to this page in order to look at the description for show_layout and set_layout which will do what you are seeking for: https://ceph.com/docs/master/man/8/cephfs/ Cheers JC On May 24, 2014, at 21:49, Sherry Shahbazi wrote: > Hi all, > > I appreciate if anyone could let me kn