[gpfsug-discuss] gpfsug-discuss Digest, Vol 138, Issue 10

[Truong Vu]

From the description, I am assuming your cluster has 3 quorum nodes. One of the quorum nodes is down.  To maintain node quorum, you should only add a non-quorum node to the cluster. Start gpfs on that node, then use mmchnode command to change that node to quorum node.
Another option is to remove the quorum role on the failed node first, then add 1 quorum node.

Regards,
Tru. Vu

On 9/7/23, 9:42 AM, "gpfsug-discuss on behalf of gpfsug-discuss-request at gpfsug.org <mailto:gpfsug-discuss-request at gpfsug.org>" <gpfsug-discuss-bounces at gpfsug.org <mailto:gpfsug-discuss-bounces at gpfsug.org> on behalf of gpfsug-discuss-request at gpfsug.org <mailto:gpfsug-discuss-request at gpfsug.org>> wrote:


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Today's Topics:


1. Question regarding quorum nodes (Tina Friedrich)
2. Re: Question regarding quorum nodes (Danny Lang)




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Message: 1
Date: Thu, 7 Sep 2023 14:28:55 +0100
From: Tina Friedrich <tina.friedrich at it.ox.ac.uk <mailto:tina.friedrich at it.ox.ac.uk>>
To: "gpfsug-discuss at gpfsug.org <mailto:gpfsug-discuss at gpfsug.org>" <gpfsug-discuss at gpfsug.org <mailto:gpfsug-discuss at gpfsug.org>>
Cc: <theteam at arc.ox.ac.uk <mailto:theteam at arc.ox.ac.uk>>
Subject: [gpfsug-discuss] Question regarding quorum nodes
Message-ID: <f0949731-e02b-99f1-a693-d67e2773fac4 at it.ox.ac.uk <mailto:f0949731-e02b-99f1-a693-d67e2773fac4 at it.ox.ac.uk>>
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Hello All,


I hope someone can answer this quickly!


We have - it seems - just lost one of our NSDs.The other took over as it 
should - but unfortunately, the protocol nodes (i.e. I have a number of 
nodes which now have stale file handles. (The file system is accessible 
on the remaining NSD server and a number of other clients.)


Unfortunately, in the 'home' cluster - the one that ones the disks - I 
only have, five servers; three of which are quorum nodes, and of course 
the failed NSD server is one of them.


The question is - can I add quorum nodes with one node down, and can I 
remove quorum functionality from a failed node?


Tina






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Message: 2
Date: Thu, 7 Sep 2023 13:39:00 +0000
From: Danny Lang <danny.lang at crick.ac.uk <mailto:danny.lang at crick.ac.uk>>
To: "gpfsug-discuss at gpfsug.org <mailto:gpfsug-discuss at gpfsug.org>" <gpfsug-discuss at gpfsug.org <mailto:gpfsug-discuss at gpfsug.org>>
Cc: "theteam at arc.ox.ac.uk <mailto:theteam at arc.ox.ac.uk>" <theteam at arc.ox.ac.uk <mailto:theteam at arc.ox.ac.uk>>
Subject: Re: [gpfsug-discuss] Question regarding quorum nodes
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<DB9PR05MB8715AC665CCA2E428F5DCBF9C0EEA at DB9PR05MB8715.eurprd05.prod.outlook.com <mailto:DB9PR05MB8715AC665CCA2E428F5DCBF9C0EEA at DB9PR05MB8715.eurprd05.prod.outlook.com>>


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Hi Tina,


The command you're looking for is:




mmchnode


https://www.ibm.com/docs/en/storage-scale/4.2.0?topic=commands-mmchnode-command <https://www.ibm.com/docs/en/storage-scale/4.2.0?topic=commands-mmchnode-command>


This will allow you to add quorum nodes and to remove.


------


I would advise checking everything prior to running commands. ?


Thanks
Danny


________________________________
From: gpfsug-discuss <gpfsug-discuss-bounces at gpfsug.org <mailto:gpfsug-discuss-bounces at gpfsug.org>> on behalf of Tina Friedrich <tina.friedrich at it.ox.ac.uk <mailto:tina.friedrich at it.ox.ac.uk>>
Sent: 07 September 2023 2:28 PM
To: gpfsug-discuss at gpfsug.org <mailto:gpfsug-discuss at gpfsug.org> <gpfsug-discuss at gpfsug.org <mailto:gpfsug-discuss at gpfsug.org>>
Cc: theteam at arc.ox.ac.uk <mailto:theteam at arc.ox.ac.uk> <theteam at arc.ox.ac.uk <mailto:theteam at arc.ox.ac.uk>>
Subject: [gpfsug-discuss] Question regarding quorum nodes




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Hello All,


I hope someone can answer this quickly!


We have - it seems - just lost one of our NSDs.The other took over as it
should - but unfortunately, the protocol nodes (i.e. I have a number of
nodes which now have stale file handles. (The file system is accessible
on the remaining NSD server and a number of other clients.)


Unfortunately, in the 'home' cluster - the one that ones the disks - I
only have, five servers; three of which are quorum nodes, and of course
the failed NSD server is one of them.


The question is - can I add quorum nodes with one node down, and can I
remove quorum functionality from a failed node?


Tina


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