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

[Christopher Black]

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
________________________________
This message is for the recipient’s use only, and may contain confidential, privileged or protected information. Any unauthorized use or dissemination of this communication is prohibited. If you received this message in error, please immediately notify the sender and destroy all copies of this message. The recipient should check this email and any attachments for the presence of viruses, as we accept no liability for any damage caused by any virus transmitted by this email.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://gpfsug.org/pipermail/gpfsug-discuss_gpfsug.org/attachments/20190617/f37c9c05/attachment.htm>