Hi, On Mon, 2011-03-07 at 22:52 +0100, Martin Mailand wrote: > > I'm running a Ceph cluster at the moment on Atom CPU's with 4GB of RAM, > > each machine has 4x2TB (4 OSD's in total) and uses about ~800MB of RAM, > > the other 3.2GB is used for caching. > > > > Hi Wido, > would you recommend a Atom CPU for an OSD? At the moment I'm looking at > this mainboard > http://www.supermicro.com/products/motherboard/ATOM/ICH9/X7SPA.cfm?typ=H&IPMI=Y, > I want to use it with 6 disks. I'm using the same board. Currently I have on running with 4 OSD's on it, but I hope to have 9 of them (each with 4 OSD's) running by the end of next week. > The 800MB your machine uses is for all 4 OSD's together? Do you have any > numbers for the CPU utilization? There are my current stats: root@atom:~# free -m total used free shared buffers cached Mem: 3963 3871 92 0 34 3247 -/+ buffers/cache: 590 3373 Swap: 7627 2 7625 root@atom:~# root@atom:~# pidof cosd 9314 8201 8101 8028 root@atom:~# > I'm looking for the sweetspot of max IO-OPs/s per watt. Although I haven't been benchmarking it really hard, I don't think the CPU will be a bottleneck. I did a expansion from 4 to 8 OSD's where the Atom machine hosts the new OSD's, about 500GB of data had to be copied to the box. The recovery pushed about 40MB/sec to the OSD's, where the CPU utilization was about 40% I hope to have the 9 Atom machines running by next, that will give me some more information. Wido > > Thanks in advance. > > martin > > > -- > To unsubscribe from this list: send the line "unsubscribe ceph-devel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
