Just in case, I would suggest preparing the commands to bring down your interface and destroy any vlan interfaces and ifgroups in the appropriate order.  That way if things go south you can act quickly and tear down the interface stack and source your /etc/rc

Hopefully that is not necessary but it cannot hurt to be prepared.

From: toasters-bounces@teaparty.net [mailto:toasters-bounces@teaparty.net] On Behalf Of steve klise
Sent: Sunday, November 09, 2014 8:44 PM
To: Parisi, Justin
Cc: toasters@teaparty.net
Subject: Re: Setting Flow Control to None on Production Filers

I changed the MTU for an iSCSI interface…. freaked me out, but was about 15 to 20 seconds, and was not under load.

On Nov 9, 2014, at 5:35 PM, Parisi, Justin <Justin.Parisi@netapp.com> wrote:

Setting flow control will create a blip, as the port gets “rebooted” during the process. Depending on load, generally less than a minute.

From: toasters-bounces@teaparty.net [mailto:toasters-bounces@teaparty.net] On Behalf Of Jeremy Webber
Sent: Sunday, November 09, 2014 6:29 PM
To: Philbert Rupkins
Cc: toasters@teaparty.net
Subject: Re: Setting Flow Control to None on Production Filers

Either method will work, but personally I would do a takeover/giveback during a maintenance windows, just to verify that the rc file changes are correct. Nothing worse than a typo causing a time-bomb.

I seem to recall somewhere that changing flow control settings may cause a momentary network outage, but I don’t have a reference for that. I’m sure the impact would be less than the pause you get during a takeover/giveback though.

HTH,

  Jeremy

On 8 Nov 2014, at 8:20 am, Philbert Rupkins <philbertrupkins@gmail.com> wrote:

Hello,

Anybody have experience setting Flow Control to none on an array (controllers) that are already being used in production?     We have a number of filers that were deployed with Flow Control set to Full on the 10GE interfaces.    NetApp best practices recommend setting Flow Control to none. 

Is it preferable to:

a)  Update the RC file with the Flow Control settings and do a takeover/giveback to apply the new flow control settings?

b)  Modify the interface Flow Control settings directly with the system up and running?    Then update the RC file so those settings will persist across future takeover/givebacks?  I know the interface would 'reset' and I'm not sure how long of an outage we can expect.

c)  Something else?

Our busiest ethernet based clients are VMWare ESXi hosts with pretty busy NFS datastores.

Thank you all in advance!   

Phil

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Jeremy Webber
Senior Systems Engineer
Animal Logic Pty Ltd
T: +61 2 8310 3577  <— please note changed number
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