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Hi matt, the hardware depends on your workload requirements,
especially when we are talking latency. I do Dell PE R630s for
Controllers, and R730 for Compute/Ceph. The latter got 8x400G Intel
S3610+18xHitachi 1.8T SAS. Depending on the workload sensitivity if
you have DBs and long distance between servers, you probably wanna
look at fiber NICs and Switches, mellanox is popular but doesn't come
for free. I do pure 6x10G Intel ixgbe in the 730s, all bonded LACP to
Arista 7050X copper, total capacity per bond is 20Gbit (2x10G active
active). I will test a pure flash array and see how it works too.

If you have some very large flash array, you may wanna consider single
socket. You can watch this video where they run DBs etc., on pure
flash arrays and give some advice
https://www.youtube.com/watch?v=OqlC7S3cUKs . thx will

On Wed, Aug 31, 2016 at 8:01 PM, Matt Jarvis
<matt.jarvis at datacentred.co.uk> wrote:
> Time once again to dredge this topic up and see what the wider operators
> community thinks this time :) There were a fair amount of summit submissions
> for Barcelona talking about converged and hyper-converged infrastructure, it
> seems to be the topic de jour from vendors at the minute despite feeling
> like we've been round this before with Nebula, Piston Cloud etc.
>
> Like a lot of others we run Ceph, and we absolutely don't converge our
> storage and compute nodes for a variety of performance and management
> related reasons. In our experience, the hardware and tuning characteristics
> of both types of nodes are pretty different, in any kind of recovery
> scenarios Ceph eats memory, and it feels like creating a SPOF.
>
> Having said that, with pure SSD clusters becoming more common, some of those
> issues may well be mitigated, so is anyone doing this in production now ? If
> so, what does your hardware platform look like, and are there issues with
> these kinds of architectures ?
>
> Matt
>
> DataCentred Limited registered in England and Wales no. 05611763
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