Almost all Mainframes have the ability to multiple operating systems.
Additionally, they can add or hot swap system capacity without disruption.
They have been designed to handle a very high volume input and output and emphasise quantity computing. This technique allows applications to run as if they were on physically different computers. A single Mainframe can even replace hundreds of smaller servers.
When working within the IT industry, especially within a large organisation, they are often used to replace multiple servers.
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