[gpfsug-discuss] [External] DSS-G sharing IPMI network

[Nicolas CALIMET]

Hi,

The recommendation is likely originating from environments where switch ports and cabling may be too constrained if using the dedicated LOM/OCP port. There is also a correlation with setting up the Confluent environment.

So to answer your question - I'm assuming you're dealing with a V3 server (SR655 V3), which indeed may have the dedicated port enabled by default:

$ nodeconfig dss45 -c IMM.SharedNicMode
dss45: IMM.SharedNicMode: Dedicated (Default: Dedicated)

$ nodeconfig dss45 IMM.SharedNicMode=jnk
dss45: jnk is not a valid value for IMM.SharedNicMode (Shared:nic0,Shared,Dedicated,Shared:nic3,Shared:nic4,Shared:nic5,Shared:nic6,Shared:nic7,Shared:nic8)

So if you want to stick to the recommendation, "nodeconfig <nodes> IMM.SharedNicMode=Shared" should be what you're looking for if you pick up the correct physical OCP port as documented.


--
Nicolas Calimet, PhD | HPC System Architect | Lenovo ISG | https://www.lenovo.com/dssg

-----Original Message-----
From: gpfsug-discuss <gpfsug-discuss-bounces at gpfsug.org> On Behalf Of Jonathan Buzzard via gpfsug-discuss
Sent: Friday, June 19, 2026 18:49
To: gpfsug-discuss at spectrumscale.org
Cc: Jonathan Buzzard <jonathan.buzzard at strath.ac.uk>
Subject: [External] [gpfsug-discuss] DSS-G sharing IPMI network


So it says this in the documentation

  In DSS-G, the recommendation is to share the IPMI and administrative
  LAN interfaces on the same Ethernet port of the DSS server, rather than
  using the dedicated network connector of the XCC for IPMI.

The question is what is the reasoning behind this? I want that
management interface strictly separated from my "normal" network. What
is the value of having it "shared" rather than separate? Noting that we
have never used the OCP/LOM card on our DSS-G servers for anything other
than provisioning and then immediately unconfigured then and relied on
the "HPC" network for everything.

Unhelpfully the servers have come configured from Lenovo in dedicated
mode and I cannot see anything in the XCC to change it. Does it require
booting into BIOS setup to change?


JAB.

--
Jonathan A. Buzzard                         Tel: +44141-5483420
HPC System Administrator, ARCHIE-WeSt.
University of Strathclyde, John Anderson Building, Glasgow. G4 0NG


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