On 29/10/2013 11:23 PM, Tom Marchant wrote:
On Mon, 28 Oct 2013 13:47:19 -0500, John Gilmore wrote:
Lynn Wheeler's numbers are arithmetically correct, but they are also
problematic.
Mainframe channels perform multiple concurrent I/O operations that are
not adequately reflected in them.
And you can have a lot of them. 1024, if I remember correctly. There is a lot
of bandwidth available to make that work.
But is that unique to a mainframe? When you compare it to a POWER system
or whatever Oracle are flogging these days it doesn't stand out. Even
commodity
servers hooked up to an enterprise class HBA can handle massive amounts
of I/O throughput.
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