Re: [ceph-users] Sequential placement

2013-08-26 Thread Chen, Xiaoxi
On Behalf Of Gregory Farnum Sent: Tuesday, August 27, 2013 5:25 AM To: Samuel Just Cc: ceph-users@lists.ceph.com; daniel pol Subject: Re: [ceph-users] Sequential placement In addition to that, Ceph uses full data journaling - if you have two journals on the OS drive then you'll be limited

Re: [ceph-users] Sequential placement

2013-08-26 Thread Gregory Farnum
In addition to that, Ceph uses full data journaling — if you have two journals on the OS drive then you'll be limited to what that OS drive can provide, divided by two (if you have two-copy happening). -Greg Software Engineer #42 @ http://inktank.com | http://ceph.com On Mon, Aug 26, 2013 at 2:09

Re: [ceph-users] Sequential placement

2013-08-26 Thread Samuel Just
I think rados bench is actually creating new objects with each IO. Can you paste in the command you used? -Sam On Tue, Aug 20, 2013 at 7:28 AM, daniel pol wrote: > Hi ! > > Ceph newbie here with a placement question. I'm trying to get a simple Ceph > setup to run well with sequential reads big pa

[ceph-users] Sequential placement

2013-08-20 Thread daniel pol
Hi ! Ceph newbie here with a placement question. I'm trying to get a simple Ceph setup to run well with sequential reads big packets (>256k). This is for learning/benchmarking purpose only and the setup I'm working with has a single server with 2 data drives, one OSD on each, journals on th