[rescue] emulation fun

Patrick Finnegan pat at computer-refuge.org
Mon Feb 2 10:25:31 CST 2009

On Monday 02 February 2009, Joshua Boyd wrote:
> On Mon, Feb 02, 2009 at 09:22:50AM -0500, Lionel Peterson wrote:
> > Execution of code doesn't equate to capable of handling the same
> > workload. Mainframes have I/O throughput that PCs can't touch.
> >
> > It would be interesting to identify/calculate the lag where a PC
> > can equal the throughput of a particular mainframe model/series.
> > (for example, a current model Dell 2950 8-core Xeon, SAS drives
> > equals the performance and throughput of an IBM 3090/200)
> What was the bandwidth of each of the channels on the 3090?  From a
> least one paper, I see the figure of 402 IOPS across all the DASD,
> but it doesn't specify the size of each IO.

Either 3 or 4.5MB/sec per channel depending on what it supported, 
for "block mode" bus and tag.

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