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Promote member to GMC

thefilmguy
Techie
Posts: 11
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I was originally planning to promote a grid member to a grid master candidate until I read that all these articles discuss using the set promote_master command, promotes an existing candidate to a grid master. Or if someone can correct me on this?

Re: Promote member to GMC

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TTiscareno Community Manager
Community Manager
Posts: 361
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There are two different concepts at work here:

 

  1. Any compatible Grid member can be enabled as a Grid Master Candidate (GMC). This is as simple as ticking a check box in its properties under the Grid -> Grid Manager -> Members tab.
  2. Only one server in your Grid will function as the Grid Master (though two appliances can operate in an active/passive role when the Grid Master is configured for High Availability).

 

If you wish to move the current Grid Master to a different Grid member that is enabled as a GMC, you would connect to the CLI for the Grid member that you are looking to promote to the Grid Master role and run the "set promote_master" command. That Grid member will then send announcements throughout the Grid, triggering the rest of the Grid to connect to it.

 

Hope this helps clear things up.

 

Regards,

Tony

Re: Promote member to GMC

thefilmguy
Techie
Posts: 11
2698     0

Ahh that was it. Option #1. Thank you.

Re: Promote member to GMC

thefilmguy
Techie
Posts: 11
2698     0

Another question: does marking this as a candidate cause a reboot or outage?

Re: Promote member to GMC

Adviser
Posts: 101
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No it doesn't.

Re: Promote member to GMC

TTiscareno Community Manager
Community Manager
Posts: 361
2698     0

Enabling the Master Candidate option does not have any impact on services. Promoting a Grid member does not cause an interruption to its services, but all other Grid members may experience a short interruption as they may pull fresh database snapshots from the new Grid Master and reload their database's.

 

Regards,

Tony

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Re: Promote member to GMC

[ Edited ]
Moderator bkoshy
Moderator
Posts: 130
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Marking a Grid Member as a GMC (candidate grid master) will not cause a reboot but it will cause a product restart on this member and this member alone because it needs to receive a complete binary database from the Grid Master and apply it rather than the partial XML database it currently has. The database switch-over involves an automated restart.

Best Regards,

Bibin

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