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: skle...@edv-design.at <mailto:skle...@edv-design.at>
Internet: www.edv-design.at <http://www.edv-design.at/>
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Giovanni Bracco
phone +39 351 8804788
E-mail giovanni.bra...@enea.it
WWW http://www.afs.enea.it/bracco
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