For our ~400 TB Ceph deployment, we bought:
(2) R720s w/ dual X5660s and 96 GB of RAM
(1) 10Gb NIC (2 interfaces per card)
(4) MD1200s per machine
...and a boat load of 4TB disks!
In retrospect, I would almost certainly would have gotten more servers. During
heavy writes we see the load spiking up to ~50 on Emperor and warnings about
slow OSDs, but we clearly seem to be on the extreme with something like 60 OSDs
per box :)
Cheers,
Lincoln
On Jan 16, 2014, at 4:09 AM, Cedric Lemarchand wrote:
>
> Le 16/01/2014 10:16, NEVEU Stephane a écrit :
>> Thank you all for comments,
>>
>> So to sum up a bit, it's a reasonable compromise to buy :
>> 2 x R720 with 2x Intel E5-2660v2, 2.2GHz, 25M Cache, 48Gb RAM, 2 x 146GB,
>> SAS 6Gbps, 2.5-in, 15K RPM Hard Drive (Hot-plug) Flex Bay for OS and 24 x
>> 1.2TB, SAS 6Gbps, 2.5in, 10K RPM Hard Drive for OSDs (journal located on
>> each osd) and PERC H710p Integrated RAID Controller, 1GB NV Cache
>> ?
>> Or is it a better idea to buy 4 servers less powerful instead of 2 ?
> I think you are facing the well known trade off between
> price/performances/usable storage size.
>
> More servers less powerfull will give you better power computation and better
> iops by usable To, but will be more expensive. An extrapolation of that that
> would be to use a blade for each To => very powerful/very expensive.
>
>
> The choice really depend of the work load you need to handle, witch is not an
> easy thing to estimate.
>
> Cheers
>
> --
> Cédric
>
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