[gpfsug-discuss] CNFS and multiple IP addresses

[Buterbaugh, Kevin L]

Hi Bryan,

Thanks for the response.

I had looked at the man page for mmchnode previously, but was misinterpreting the wording.  I was under the impression that the “—cnfs-interface” option could only be used to add IP addresses or delete a node from CNFS with the “DEFAULT” keyword.

Your explanation makes sense - thanks for clarifying…

Kevin

On May 3, 2016, at 3:31 PM, Bryan Banister <bbanister at jumptrading.com<mailto:bbanister at jumptrading.com>> wrote:

Hi Kevin,

Look at the man page for mmchnode, you’ll need to use the “--cnfs-interface=<ip_address_list>” option.

BTW, I get the cleanest looking man pages for GPFS commands by using the “-E ascii” option.

You may also have a Round-Robin DNS record setup that includes the current IP addresses that you will likely want to update, not forgetting about DNS caching timeouts that you may need to let expire before no client attempts to mount from an old address.

Hope that helps!
-Bryan

From: gpfsug-discuss-bounces at spectrumscale.org<mailto:gpfsug-discuss-bounces at spectrumscale.org> [mailto:gpfsug-discuss-bounces at spectrumscale.org] On Behalf Of Buterbaugh, Kevin L
Sent: Tuesday, May 03, 2016 3:20 PM
To: gpfsug main discussion list <gpfsug-discuss at spectrumscale.org<mailto:gpfsug-discuss at spectrumscale.org>>
Subject: [gpfsug-discuss] CNFS and multiple IP addresses

Hi All,

I’ve looked in the documentation and on the GPFS Wiki for the answer to this question but haven’t found it.  Please feel free to point me to docs / web pages if I’ve missed something.

One of the GPFS clusters I administer uses CNFS, which I did not set up on this cluster … and the person who did is now an employee of another organization.  The cluster in question runs GPFS 4.1.0.x, although I doubt that matters.

There are 4 CNFS servers, each of which has 2 IP addresses listed under the CNFS IP address list when running “mmlscluster —cnfs”.  I want to delete one of those two IP addresses for each server due to a planned network reorganization.  How do I do that?  Or do I need to completely delete the server from CNFS and add it back in with just the one IP address I want to keep?

Thanks in advance…

—
Kevin Buterbaugh - Senior System Administrator
Vanderbilt University - Advanced Computing Center for Research and Education
Kevin.Buterbaugh at vanderbilt.edu<mailto:Kevin.Buterbaugh at vanderbilt.edu> - (615)875-9633




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—
Kevin Buterbaugh - Senior System Administrator
Vanderbilt University - Advanced Computing Center for Research and Education
Kevin.Buterbaugh at vanderbilt.edu<mailto:Kevin.Buterbaugh at vanderbilt.edu> - (615)875-9633



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