advice with hardware configuration

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On 05/06/2014 05:07 PM, Xabier Elkano wrote:
>
> Hi,
>
> I'm designing a new ceph pool with new hardware and I would like to
> receive some suggestion.
> I want to use a replica count of 3 in the pool and the idea is to buy 3
> new servers with a 10-drive 2,5" chassis each and 2 10Gbps nics. I have
> in mind two configurations:
>

Why 3 machines? That's something I would not recommend. If you want 30 
drives I'd say, go for 8 machines with 4 drives each.

If a single machine fails it's 12.5% of the cluster size instead of 33%!

I always advise that a failure of a single machine should be 10% or less 
of the total cluster size.

Wido

> 1- With journal in SSDs
>
> OS: 2xSSD intel SC3500 100G Raid 1
> Journal: 2xSSD intel SC3700 100G, 3 journal for each SSD
> OSD: 6 SAS10K 900G (SAS2 6Gbps), each running an OSD process. Total size
> for OSDs: 5,4TB
>
> 2- With journal in a partition in the spinners.
>
> OS: 2xSSD intel SC3500 100G Raid 1
> OSD+journal: 8 SAS15K 600G (SAS3 12Gbps), each runing an OSD process and
> its journal. Total size for OSDs: 3,6TB
>
> The budget in both configuration is similar, but the total capacity not.
> What would be the best configuration from the point of view of
> performance? In the second configuration I know the controller write
> back cache could be very critical, the servers has a LSI 3108 controller
> with 2GB Cache. I have to plan this storage as a KVM image backend and
> the goal is the performance over the capacity.
>
> On the other hand, with these new hardware, what would be the best
> choice: create a new pool in an existing cluster or create a complete
> new cluster? Are there any advantages in creating and maintaining an
> isolated new cluster?
>
> thanks in advance,
> Xabier
>
>
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> ceph-users at lists.ceph.com
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>


-- 
Wido den Hollander
42on B.V.
Ceph trainer and consultant

Phone: +31 (0)20 700 9902
Skype: contact42on


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