Re: What would a good OSD node hardware configuration look like?

[Stefan Priebe - Profihost AG <s.priebe@profihost.ag>]

Am 06.11.2012 01:14, schrieb Josh Durgin:
> On 11/05/2012 09:13 AM, Dennis Jacobfeuerborn wrote:
>> Hi,
>> I'm thinking about building a ceph cluster and I'm wondering what a good
>> configuration would look like for 4-8 (and maybe more) 2HU 8-disk or 3HU
>> 16-disk systems.
>> Would it make sense to make each disk an individual OSD or should I
>> perhaps
>> create several raid-0 and create OSDs from those?
>
> This mainly depends on your ratio of disks to cpu/ram. Generally we
> recommend 1GB ram and 1Ghz per OSD. If you've got enough cpu/ram,
> running 1 OSD/disk is pretty common. It makes recovering from a
> single disk failure faster.

Just i node while using SSDs i've seen osd processes using up to two 3.6 
Ghz cores. So under heavy load and disks and network with enough speed 1 
ghz might be even too low. Right now i'm calculating with 1 3.6Ghz Core 
per OSD when using 10GBE and SSDs.

Greets,
Stefan