Load spikes on nfs server, mongodb installed on nfs clients

Hello. I installed mongodb-org-server 7.0.0 on all of our ubuntu 22.04 lab computers (about 200), for use in a software development class (just the default install, bindIp: 127.0.0.1). When mongod is started on all lab computers, I see load spikes on my nfs server, every 21 minutes. When I stop the mongod processes, the spikes go away (see image).

Any ideas why a local install is affecting my nfs server (which serves user home directories to the lab computers)? Is there some scan or process in mongod that fires off every 21 minutes?

Happy to provide more details if needed. Thanks for any insights. Also, we haven’t even started using mongodb yet, I’ve just installed it on the lab computers.

Jeff

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