In a message dated 9/7/2007 10:03:18 P.M. Central Daylight Time, [EMAIL PROTECTED] writes: >I suggest browsing Pat Artis' website for some quality education on FICON. I am doing that now and browsing the general Internet, too. I have learned a lot over the years from Pat Artis. Based on everything I have read lately, I now believe it is possible to start 256 I/O requests from one LPAR to the same device before the first one ends if that device is in an ESS LCU with four FICON channels between that LCU and the LPAR that does the I/Os, if that LPAR has the device defined as a PAV base device with 255 alias devices in the same LCU, and if all four FICON channels are in the base device's UCB channel path matrix. These I/Os will appear to be simultaneous, but at any given instant, no more than 64 of the 256 will be actively transferring data to or from the LCU. The other 192 will be disconnected for various reasons. This is a theoretical maximum and not necessarily a practical limit. If eight ESCON channels are the link between the device and the ESS LCU, then the number of simultaneously startable I/Os to the device will be more than eight but smaller than 256. Is all of this correct? I have been away from the bleeding edge too long. :-( Bill Fairchild Plainfield, IL
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