[gpfsug-discuss] Question about subnets parameter and remote cluster mounts

[Achim Rehor]

correct, there is no need to put client and storage into different
subnets, 
and it is also not necessary to specify the subnet parameter at all,
when they share the same network. 

The subnets parameter is very helpful, though, if you are using
multiple networks, and want to use specific ones for communication with
one or the other remote cluster.

-- 
Mit freundlichen Grüßen / Kind regards

Achim Rehor

Technical Support Specialist S​pectrum Scale and ESS (SME)
Advisory Product Services Professional
IBM Systems Storage Support - EMEA

Achim.Rehor at de.ibm.com 				+49-170-
4521194	 							
IBM Deutschland GmbH 
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-----Original Message-----
From: Jaime Pinto <pinto at scinet.utoronto.ca>
Reply-To: gpfsug main discussion list <gpfsug-discuss at gpfsug.org>
To: gpfsug-discuss at gpfsug.org
Subject: [EXTERNAL] Re: [gpfsug-discuss] Question about subnets
parameter and remote cluster mounts
Date: Wed, 03 May 2023 09:35:35 -0400

/etc/sysconfig/network-scripts/ifcfg-ib0

Example:
DEVICE=ib0
NM_CONTROLLED=no
BOOTPROTO=none
ONBOOT=yes
IPADDR=192.168.0.1
NETMASK=255.255.0.0

There is no need to place storage and client clusters on different
subnets.
Cheers
Jaime

On 5/3/2023 09:17:56, Leonardo Sala wrote:
> Dear all,
> 
> I do have a very naive question about the subnets parameter. I read
> the various docs [*], but it is not clear to me how do best define it
> in my use case. As an example, I have a CL1 storage cluster, and a
> CL2 client cluster that remotely mounts CL1 storage, and they are
> both connected to a private IB network 192.168.0.0. Where should I
> define subnets=192.168.0.0/CL1;CL2 : on CL1, CL2 or both? Some
> directionality seems implied in the docs, but it was not totally
> clear to me...
> 
> Thanks a lot!
> 
> cheers
> 
> leo
> 
> [*]
> 
> https://www.ibm.com/docs/en/spectrum-scale/5.1.7?topic=system-using-
> remote-access-multiple-network-definitions
> 
> https://www.ibm.com/docs/en/spectrum-scale/5.1.7?topic=communication-
> using-public-private-ip-addresses-gpfs-nodes
> 
> -- 
> Paul Scherrer Institut
> Dr. Leonardo Sala
> Group Leader Data Analysis and Research Infrastructure
> Deputy Department Head a.i Science IT Infrastructure and Services
> department
> Science IT Infrastructure and Services department (AWI)
> WHGA/036
> Forschungstrasse 111
> 5232 Villigen PSI
> Switzerland
> 
> Phone: +41 56 310 3369
> leonardo.sala at psi.ch
> www.psi.ch
> 
> 
> _______________________________________________
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---
Jaime Pinto - Storage Analyst
SciNet HPC Consortium - www.scinet.utoronto.ca
University of Toronto
661 University Ave. (MaRS), Suite 1140
Toronto, ON, M5G1M1
P: 416-978-2755
C: 416-505-1477

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