[gpfsug-discuss] Steps for gracefully handling bandwidth reduction during network maintenance

[Luis Bolinches]

Hi

I would really look into QoS instead. 

--
Cheers

> On 17 Jun 2019, at 19.33, Alex Chekholko <alex at calicolabs.com> wrote:
> 
> Hi Chris,
> 
> I think the next thing to double-check is when the maxMBpS change takes effect.  You may need to restart the nsds.  Otherwise I think your plan is sound.
> 
> Regards,
> Alex
> 
> 
>> On Mon, Jun 17, 2019 at 9:24 AM Christopher Black <cblack at nygenome.org> wrote:
>> Our network team sometimes needs to take down sections of our network for maintenance. Our systems have dual paths thru pairs of switches, but often the maintenance will take down one of the two paths leaving all our nsd servers with half bandwidth.
>> 
>> Some of our systems are transmitting at a higher rate than can be handled by half network (2x40Gb hosts with tx of 50Gb+).
>> 
>> What can we do to gracefully handle network maintenance reducing bandwidth in half?
>> 
>> Should we set maxMBpS for affected nodes to a lower value? (default on our ess appears to be maxMBpS = 30000, would I reduce this to ~4000 for 32Gbps?)
>> 
>> Any other ideas or comments?
>> 
>> Our hope is that metadata operations are not affected much and users just see jobs and processes read or write at a slower rate.
>> 
>>  
>> 
>> Best,
>> 
>> Chris
>> 
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