We did not explore the issue of the IBM support and for budget
limitation and for the mandatory integration of the data space between
the two clusters, we decided to try the setup of the multi-fabric
infrastructure and up to now it has been working without problems.
Giovanni
On 02/02/21 14:10, Walter Sklenka wrote:
Hi Giovanni!
Thank you for your offer! 😊
it is planned to be implemented in June or so
We will use RHEL 8.x and newest gpfs version available
Only one question for this moment if I am allowed:
Did you ever ran into any problems with IBM support? I mean they say in
the FAQ shortly "not supported" , but do they in your environment or do
you accept that rdma problems would be needed to be fixed without IBM
Thank you very much and have great days! And keep healthy!
Best regards walter
-----Original Message-----
From: Giovanni Bracco <[email protected]>
Sent: Montag, 1. Februar 2021 20:42
To: Walter Sklenka <[email protected]>
Cc: gpfsug main discussion list <[email protected]>
Subject: Re: [gpfsug-discuss] OPA HFI and Mellanox HCA on same NSD
Server with only ib rdma enabled
On 30/01/21 21:01, Walter Sklenka wrote:
> Hi Giovanni!
> Thats great! Many thanks for your fast and detailed answer!!!!
> So this is the way we will go too!
>
> Have a nice weekend and keep healthy!
> Best regards
> Walter
>
I suppose you will implement the solution with more recent versions of
the software components, so please let me know if everything works!
If yu have any issues I am ready to discuss!
Regards
Giovanni
> -----Original Message-----
> From: Giovanni Bracco <[email protected]
<mailto:[email protected]>>
> Sent: Samstag, 30. Jänner 2021 18:08
> To: gpfsug main discussion list <[email protected]
<mailto:[email protected]>>;
> Walter Sklenka <[email protected]
<mailto:[email protected]>>
> Subject: Re: [gpfsug-discuss] OPA HFI and Mellanox HCA on same NSD
> Server with only ib rdma enabled
>
> In our HPC infrastructure we have 6 NSD server, running CentOS 7.4,
each of them with with 1 Intel QDR HCA to a QDR Cluster (now 100 nodes
SandyBridge cpu it was 300 nodes CentOS 6.5), 1 OPA HCA to the main OPA
Cluster (400 nodes Skylake cpu, CentOS 7.3) and 1 Mellanox FDR to DDN
storages and it works nicely using RDMA since 2018. GPFS 4.2.3-19.
> See
> F. Iannone et al., "CRESCO ENEA HPC clusters: a working example of a
> multifabric GPFS Spectrum Scale layout," 2019 International Conference
> on High Performance Computing & Simulation (HPCS), Dublin, Ireland,
> 2019, pp. 1051-1052, doi: 10.1109/HPCS48598.2019.918813
>
> When setting up the system the main trick has been:
> just use CentOS drivers and do not install OFED We do not use IPoIB.
>
> Giovanni
>
> On 30/01/21 06:45, Walter Sklenka wrote:
>> Hi!
>>
>> Is it possible to mix OPAcards and Infininiband HCAs on the same server?
>>
>> In the faq
>> https://www.ibm.com/support/knowledgecenter/en/STXKQY/gpfsclustersfaq.
>> html#rdma
>>
>>
>> They talk about RDMA :
>>
>> "RDMA is NOT supported on a node when both Mellanox HCAs and Intel
>> Omni-Path HFIs are ENABLED for RDMA."
>>
>> So do I understand right: When we do NOT enable the opa interface we
>> can still enable IB ?
>>
>> The reason I ask is, that we have a gpfs cluster of 6 NSD Servers
>> (wih access to storage) with opa interfaces which provide access to
>> remote cluster also via OPA.
>>
>> A new cluster with HDR interfaces will be implemented soon
>>
>> They shell have access to the same filesystems
>>
>> When we add HDR interfaces to NSD servers and enable rdma on this
>> network while disabling rdma on opa we would accept the worse
>> performance via opa . We hope that this provides still better perf
>> and less technical overhead than using routers
>>
>> Or am I totally wrong?
>>
>> Thank you very much and keep healthy!
>>
>> Best regards
>>
>> Walter
>>
>> Mit freundlichen Grüßen
>> */Walter Sklenka/*
>> */Technical Consultant/*
>>
>> EDV-Design Informationstechnologie GmbH Giefinggasse 6/1/2, A-1210
>> Wien
>> Tel: +43 1 29 22 165-31
>> Fax: +43 1 29 22 165-90
>> E-Mail: [email protected] <mailto:[email protected]>
<mailto:[email protected]>
>> Internet: www.edv-design.at <http://www.edv-design.at>
<http://www.edv-design.at/>
>>
>>
>> _______________________________________________
>> gpfsug-discuss mailing list
>> gpfsug-discuss at spectrumscale.org
>> http://gpfsug.org/mailman/listinfo/gpfsug-discuss
>>
>
> --
> Giovanni Bracco
> phone +39 351 8804788
> E-mail [email protected] <mailto:[email protected]>
> WWW http://www.afs.enea.it/bracco
>
--
Giovanni Bracco
phone +39 351 8804788
E-mail [email protected] <mailto:[email protected]>
WWW http://www.afs.enea.it/bracco
--
Giovanni Bracco
phone +39 351 8804788
E-mail [email protected]
WWW http://www.afs.enea.it/bracco
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