Queries in phosphor-pid-control(swampd)

Queries in phosphor-pid-control(swampd)

[Kumar Thangavel]

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Classification: Internal
Hi All,

      Does the current phosphor-pid-control handled the fan failures or if fan values is 0 ?  Looks like, it ignores the fan values is 0 case.
      Could you please clarify me, how the fan(single/both) failures handled. if both fan failures, Do we need to power off the chassis or need to do power sled cycle ?

Thanks,
Kumar.
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RE: Queries in phosphor-pid-control(swampd)

[Kumar Thangavel]

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Classification: Internal
Hi All,

      Gentle Remainder !

       Could you please provide your inputs on this.

Thanks,
Kumar.

From: Kumar Thangavel
Sent: Thursday, November 5, 2020 5:52 PM
To: openbmc@lists.ozlabs.org
Cc: Patrick Venture <venture@google.com>; Josh Lehan <krellan@google.com>; Velumani T-ERS,HCLTech <velumanit@hcl.com>; Vijay Khemka <vijaykhemka@fb.com>; Patrick Williams <patrickw3@fb.com>; sdasari@fb.com
Subject: Queries in phosphor-pid-control(swampd)

Classification: Internal
Hi All,

      Does the current phosphor-pid-control handled the fan failures or if fan values is 0 ?  Looks like, it ignores the fan values is 0 case.
      Could you please clarify me, how the fan(single/both) failures handled. if both fan failures, Do we need to power off the chassis or need to do power sled cycle ?

Thanks,
Kumar.
::DISCLAIMER::
________________________________
The contents of this e-mail and any attachment(s) are confidential and intended for the named recipient(s) only. E-mail transmission is not guaranteed to be secure or error-free as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete, or may contain viruses in transmission. The e mail and its contents (with or without referred errors) shall therefore not attach any liability on the originator or HCL or its affiliates. Views or opinions, if any, presented in this email are solely those of the author and may not necessarily reflect the views or opinions of HCL or its affiliates. Any form of reproduction, dissemination, copying, disclosure, modification, distribution and / or publication of this message without the prior written consent of authorized representative of HCL is strictly prohibited. If you have received this email in error please delete it and notify the sender immediately. Before opening any email and/or attachments, please check them for viruses and other defects.
________________________________

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Re: Queries in phosphor-pid-control(swampd)

[Patrick Venture]

On Thu, Nov 5, 2020 at 4:22 AM Kumar Thangavel <thangavel.k@hcl.com> wrote:
>
> Classification: Internal
>
> Hi All,
>
>
>
>       Does the current phosphor-pid-control handled the fan failures or if fan values is 0 ?  Looks like, it ignores the fan values is 0 case.
>
>       Could you please clarify me, how the fan(single/both) failures handled. if both fan failures, Do we need to power off the chassis or need to do power sled cycle ?

The answers to the failure behaviors you wish are outside the scope of
controlling the fans themselves.  As I understand it, it's up to you
or your use case what happens when fails start failing. The pid
control daemon has default fail-safe values you can set, as well as
minimum RPM set-points, so that if some things fail, it'll still move
forward operating in a best effort to cool the system.  But with fans
failing, if there's something more one wishes to do with it, my
recommendation would be to reach out with a broader email subject line
-- there may be something already in openbmc (probably is) that'll
track failures and trigger behaviors.

However, currently pid control doesn't "manage the system."  Which it
sounds like you want.  Or not?  Your question sounds like you're not
sure what the system _should_ do in a fan failure case, to which I
cannot reply.

Thanks!

>
>
>
> Thanks,
>
> Kumar.
>
> ::DISCLAIMER::
> ________________________________
> The contents of this e-mail and any attachment(s) are confidential and intended for the named recipient(s) only. E-mail transmission is not guaranteed to be secure or error-free as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete, or may contain viruses in transmission. The e mail and its contents (with or without referred errors) shall therefore not attach any liability on the originator or HCL or its affiliates. Views or opinions, if any, presented in this email are solely those of the author and may not necessarily reflect the views or opinions of HCL or its affiliates. Any form of reproduction, dissemination, copying, disclosure, modification, distribution and / or publication of this message without the prior written consent of authorized representative of HCL is strictly prohibited. If you have received this email in error please delete it and notify the sender immediately. Before opening any email and/or attachments, please check them for viruses and other defects.
> ________________________________

RE: Queries in phosphor-pid-control(swampd)

[Kumar Thangavel]

Classification: Internal

Hi Patrick,

          Thanks for your response.  

          Our requirement is when all fan fails in the system, the slots should be 12 V Power off.  I will send the separate mail for this in detail.

Thanks,
Kumar.

-----Original Message-----
From: Patrick Venture <venture@google.com> 
Sent: Wednesday, November 11, 2020 8:34 PM
To: Kumar Thangavel <thangavel.k@hcl.com>
Cc: openbmc@lists.ozlabs.org; Josh Lehan <krellan@google.com>; Velumani T-ERS,HCLTech <velumanit@hcl.com>; Vijay Khemka <vijaykhemka@fb.com>; Patrick Williams <patrickw3@fb.com>; sdasari@fb.com
Subject: Re: Queries in phosphor-pid-control(swampd)

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On Thu, Nov 5, 2020 at 4:22 AM Kumar Thangavel <thangavel.k@hcl.com> wrote:
>
> Classification: Internal
>
> Hi All,
>
>
>
>       Does the current phosphor-pid-control handled the fan failures or if fan values is 0 ?  Looks like, it ignores the fan values is 0 case.
>
>       Could you please clarify me, how the fan(single/both) failures handled. if both fan failures, Do we need to power off the chassis or need to do power sled cycle ?

The answers to the failure behaviors you wish are outside the scope of controlling the fans themselves.  As I understand it, it's up to you or your use case what happens when fails start failing. The pid control daemon has default fail-safe values you can set, as well as minimum RPM set-points, so that if some things fail, it'll still move forward operating in a best effort to cool the system.  But with fans failing, if there's something more one wishes to do with it, my recommendation would be to reach out with a broader email subject line
-- there may be something already in openbmc (probably is) that'll track failures and trigger behaviors.

However, currently pid control doesn't "manage the system."  Which it sounds like you want.  Or not?  Your question sounds like you're not sure what the system _should_ do in a fan failure case, to which I cannot reply.

Thanks!

>
>
>
> Thanks,
>
> Kumar.
>
> ::DISCLAIMER::
> ________________________________
> The contents of this e-mail and any attachment(s) are confidential and intended for the named recipient(s) only. E-mail transmission is not guaranteed to be secure or error-free as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete, or may contain viruses in transmission. The e mail and its contents (with or without referred errors) shall therefore not attach any liability on the originator or HCL or its affiliates. Views or opinions, if any, presented in this email are solely those of the author and may not necessarily reflect the views or opinions of HCL or its affiliates. Any form of reproduction, dissemination, copying, disclosure, modification, distribution and / or publication of this message without the prior written consent of authorized representative of HCL is strictly prohibited. If you have received this email in error please delete it and notify the sender immediately. Before opening any email and/or attachments, please check them for viruses and other defects.
> ________________________________