Multiple BMCs in a system: IPMB? Redfish? MCTP?

[Neeraj Ladkani]

Redfish defines computer system to be multiple chassis or multiple blades within a chassis.  It would be good to clarify if you are referring to “System” as:


  *   Multiple chassis with their own BMCs ( Storage, Compute, GPU etc )
  *   Multiple Blades with their own BMC within a chassis.

Neeraj

From: openbmc <openbmc-bounces+neladk=microsoft.com at lists.ozlabs.org> On Behalf Of Vijay Khemka
Sent: Wednesday, April 29, 2020 5:16 PM
To: Nancy Yuen <yuenn at google.com>; OpenBMC Maillist <openbmc at lists.ozlabs.org>
Subject: [EXTERNAL] Re: Multiple BMCs in a system: IPMB? Redfish? MCTP?

Hi Nancy,
We are currently using (1) in our current multi host design. Option (3) also looks good.

Regards
-Vijay

From: openbmc <openbmc-bounces+vijaykhemka=fb.com at lists.ozlabs.org<mailto:openbmc-bounces+vijaykhemka=fb.com at lists.ozlabs.org>> on behalf of Nancy Yuen <yuenn at google.com<mailto:yuenn at google.com>>
Date: Wednesday, April 29, 2020 at 3:53 PM
To: OpenBMC Maillist <openbmc at lists.ozlabs.org<mailto:openbmc at lists.ozlabs.org>>
Subject: Multiple BMCs in a system: IPMB? Redfish? MCTP?

I've talked with some people a while back (long while back) about multiple BMCs in a system.  Either for redundancy or managing separate parts of a system.   I'm wondering what other people are thinking in this area if at all.

We are considering similar designs and I'm looking into options for BMC-BMC communications.  Some BMCs may not be externally accessible. Here are some options that we've looked at:

  1.  i2c/IPMB
  2.  usbnet/Redfish
  3.  i2c/MCTP/PLDM or something else?
  4.  internal network via switch chip/Redfish or MCTP
 I'd like to reduce our use of IPMI so I want to avoid (1).

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Nancy
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