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Is there any way I can open multiple Unix sessions on different servers at the same time? I don't want to use ssh, as I want to monitor the CPUs of all those servers at the same time, which will keep changing with time.

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Do you mean code.google.com/p/parallel-ssh? Can you expand on your question? You want them in multiple terminals? You want an aggregated single terminal monitoring some set of variables? It has to update in real-time? – polynomial Aug 29 '11 at 7:37
Define what you mean by "open multiple Unix session of different servers" and what it would mean in contrast to using SSH. – rozcietrzewiacz Aug 29 '11 at 16:08

If not using X11 then screen will allow you to multiplex terminals and have multiple ssh sessions running.

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Also try tmux a terminal multiplexer. – Cheng Aug 29 '11 at 11:09

There are a lot of open source monitoring software that you could use to keep statistics of CPU usage.

You can use something "simple" as collectd or some enterprise full fledged monitor system as nagios.

In any case, the simplest technology to fetch cpu/load/memory statistics from a set of remote server is SNMP.

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