Open Stack

100 servers has your running  400GB of ram and 2TB of storage per server 
or 4TB of storage overall.

That would actually be within the range of 2 systems using DBRB and SSDs 
and you would get extremely fast performance.

I would argue that CEPH works best for large data sets and where there 
are LOTS of disks.
A 2 MON/OSD solution will work and is a place to start building a larger 
system but not as the final target of the system.

That however is just my observations.

On 04/04/2014 02:17 AM, Ian Marshall wrote:
> Ceph as unified storage solution
>
> Hi
>
> I am implementing a small Openstack production system across two 
> sites. This will initially have 2 controller nodes (also acting as 
> network nodes) and 2 compute nodes at each site. Network up to hadware 
> load balancers will be 10gbe.
>
> Expectation is we will be running about 80-100 VMs at each site (4gb 
> Ram and 20gb volumes). These will boot and run from block storage. 
> About 90% of these will run Tomcat servers, the others Apache. They 
> will be stateless.
>
> I have been told Ceph solution will not provide the necessary 
> performance compared to SAN (EquaLogic) unless using SSD drives for 
> journals which is out of budget at present. If I was confident to go 
> with Ceph - I would be planning 2 storage servers with 10k sas drives 
> and write back cache on raid controllers and have each drive as Raid0 
> with a partition for journals.
>
> Could anyone provide evidence of using Ceph for this size production, 
> as my preference is a ceph based stirage solution to privide 
> flexibility in storage - especially as long term plan is to replicate 
> across WAN.
>
> Pros and cons between a SAN and Ceph would also be appreciated.
>
> Regards
> Ian
>
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