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Why does extracting a large .zst file cause another server with a cifs mount to come to a halt?

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I have a large .zst file I need extracted on a backup server running CentOS. I begin to extract the file using zstd -d file_name.zst. I was going to then do tar -xvf file_name once that finished. Everything seemed to be going normally.

I have an Ubuntu server that has a directory on the CentOS server mounted. What I don't understand is how this would make that server slow down. As soon as I killed the process, everything went back to normal. I did it again, and the server with the mount slowed to a crawl.

Top was not showing anything crazy, and I didn't find anything of significance in atop logs on the slowed server.

How can I troubleshoot this? It just seems very odd to me.

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