[lustre-discuss] E5-2667 or E5-2697A for MDS

[Riccardo Veraldi]

Just out of curiosity how much is recommended to run a MDS on a virtual
machine (oVirt) ?
Are there any performance comparison/testing available ?
thanks

On 9/28/17 9:49 AM, Dilger, Andreas wrote:
> On Sep 28, 2017, at 04:54, Forrest.Wc.Ling at dell.com wrote:
>> Hello :   
>>  
>> Our customer is going to configure Lustre FS, which will have a lot of small files to be accessed.
>>  
>> We are to configure 1TB Memory for MDS.
>>  
>> Regarding to CPU configuration , can we propose E5-2667 or E5-2697A for MDS for good performance ?
>>  
>> E5-2667 v4 : 3.2GHz, 8 Cores
>> E5-2697A v4: 2.6GHz, 16 cores
> There is a good presentation showing CPU speed vs. cores vs. MDS performance:
>
> https://www.eofs.eu/_media/events/lad14/03_shuichi_ihara_lustre_metadata_lad14.pdf
>
> Normally, higher GHz is good for the MDS, but if it reduces the number of
> cores by half, it may not be worthwhile.  It also depends on whether your
> workloads are mostly parallel (in which case more cores * GHz is better),
> or more serial (in which case a higher GHz is better).
>
> In this case, cores * GHz is 3.2GHz * 8 = 25.6GHz, and 2.6GHz * 16 = 41.6GHz,
> so you would probably get better aggregate performance from the E5-2697A as
> long as you have sufficient client parallelism to drive the system heavily.
>
> Cheers, Andreas
> --
> Andreas Dilger
> Lustre Principal Architect
> Intel Corporation
>
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