[gpfsug-discuss] changing default configuration values

Mon Oct 9 19:55:45 BST 2017

Thanks John!

Funnily enough playing with node classes is what sent me down this path. 
I had a bunch of nodes defined (just over 1000) with a lower pagepool 
than the default. I then started using nodeclasses to clean up the 
config and I noticed that if you define a parameter with a nodeclass it 
doesn't override any previously set values for nodes in the node class. 
What I mean by that is if you do this:

- mmchconfig pagepool=256M -N n001
- add node n001 to nodeclass mynodeclass
- mmchconfig pagepool=256M -N mynodeclass

after the 2nd chconfig there is still a definition for pagepool=256M for 
node n001. I tried to clean things up by doing "mmchconfig 
pagepool=DEFAULT -N n001" however the default value of the pagepool in 
our config is 1024M not the "1G" mmchconfig expects as the defualt value 
so I wasn't able to remove the explicit definition of pagepool for n001. 
What I ended up doing was an "mmchconfig pagepool=1024M -N n001" and 
that removed the explicit definitions.

-Aaron

On 10/9/17 4:38 AM, John Hearns wrote:
> Aaron,
> 
> The reply you just got her is absolutely the correct one.
> 
> However, its worth contributing something here. I have recently bene 
> dealing with the parameter verbsPorts – which is a list of the 
> interfaces which verbs should use. I found on our cluyster it was set to 
> use dual ports for all nodes, including servers, when only our servers 
> have dual ports.  I will follow the advice below and make a global 
> change, then change back the configuration for the server.
> 
> It is worth looking though at  mmllnodeclass –all
> 
> There is a rather rich set of nodeclasses, including   clientNodes 
>    managerNodes nonNsdNodes  nonQuorumNodes
> 
> So if you want to make changes to a certain type of node in your cluster 
> you will be able to achieve it using nodeclasses.
> 
> Bond, James Bond
> 
> commander.bond at mi6.gov.uk
> 
> *From:* gpfsug-discuss-bounces at spectrumscale.org 
> [mailto:gpfsug-discuss-bounces at spectrumscale.org] *On Behalf Of *IBM 
> Spectrum Scale
> *Sent:* Saturday, October 07, 2017 5:07 AM
> *To:* gpfsug main discussion list <gpfsug-discuss at spectrumscale.org>
> *Cc:* gpfsug-discuss-bounces at spectrumscale.org
> *Subject:* Re: [gpfsug-discuss] changing default configuration values
> 
> Hi Aaron,
> 
> The default value applies to all nodes in the cluster. Thus changing it 
> will change all nodes in the cluster. You need to run mmchconfig to 
> customize the node override again.
> 
> 
> Regards, The Spectrum Scale (GPFS) team
> 
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> Inactive hide details for Aaron Knister ---10/06/2017 06:30:20 PM---Is 
> there a way to change the default value of a configuratiAaron Knister 
> ---10/06/2017 06:30:20 PM---Is there a way to change the default value 
> of a configuration option without overriding any overrid
> 
> From: Aaron Knister <aaron.s.knister at nasa.gov 
> <mailto:aaron.s.knister at nasa.gov>>
> To: gpfsug main discussion list <gpfsug-discuss at spectrumscale.org 
> <mailto:gpfsug-discuss at spectrumscale.org>>
> Date: 10/06/2017 06:30 PM
> Subject: [gpfsug-discuss] changing default configuration values
> Sent by: gpfsug-discuss-bounces at spectrumscale.org 
> <mailto:gpfsug-discuss-bounces at spectrumscale.org>
> 
> ------------------------------------------------------------------------
> 
> 
> 
> 
> Is there a way to change the default value of a configuration option
> without overriding any overrides in place?
> 
> Take the following situation:
> 
> - I set parameter foo=bar for all nodes (mmchconfig foo=bar)
> - I set parameter foo to baz for a few nodes (mmchconfig foo=baz -N
> n001,n002)
> 
> Is there a way to then set the default value of foo to qux without
> changing the value of foo for nodes n001 and n002?
> 
> -Aaron
> 
> -- 
> Aaron Knister
> NASA Center for Climate Simulation (Code 606.2)
> Goddard Space Flight Center
> (301) 286-2776
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-- 
Aaron Knister
NASA Center for Climate Simulation (Code 606.2)
Goddard Space Flight Center
(301) 286-2776