I am using these for other stuff:
http://www.supermicro.com/products/accessories/addon/AOC-STG-b4S.cfm

If you want NIC, also think of the "network side" : SFP+ switch are very
common, 40G is less common, 25G is really new (= really few products)



On 13/07/2016 16:50, Warren Wang - ISD wrote:
> I¹ve run the Mellanox 40 gig card. Connectx 3-Pro, but that¹s old now.
> Back when I ran it, the  drivers were kind of a pain to deal with in
> Ubuntu, primarily during PXE. It should be better now though.
> 
> If you have the network to support it, 25Gbe is quite a bit cheaper per
> port, and won¹t be so hard to drive. 40Gbe is very hard to fill. I
> personally probably would not do 40 again.
> 
> Warren Wang
> 
> 
> 
> On 7/13/16, 9:10 AM, "ceph-users on behalf of Götz Reinicke - IT
> Koordinator" <ceph-users-boun...@lists.ceph.com on behalf of
> goetz.reini...@filmakademie.de> wrote:
> 
>> Am 13.07.16 um 14:59 schrieb Joe Landman:
>>>
>>>
>>> On 07/13/2016 08:41 AM, c...@jack.fr.eu.org wrote:
>>>> 40Gbps can be used as 4*10Gbps
>>>>
>>>> I guess welcome feedbacks should not be stuck by "usage of a 40Gbps
>>>> ports", but extented to "usage of more than a single 10Gbps port, eg
>>>> 20Gbps etc too"
>>>>
>>>> Is there people here that are using more than 10G on an ceph server ?
>>>
>>> We have built, and are building Ceph units for some of our customers
>>> with dual 100Gb links.  The storage box was one of our all flash
>>> Unison units for OSDs.  Similarly, we have several customers actively
>>> using multiple 40GbE links on our 60 bay Unison spinning rust disk
>>> (SRD) box.
>>>
>> Now we get closer. Can you tell me which 40G Nic you use?
>>
>>    /götz
>>
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