In a message dated 5/8/2008 2:17:54 P.M. Central Daylight Time, [EMAIL PROTECTED] writes: >We established a PPRC Metro Mirror - Loop Back environment, which means that we PPRC from the front end of the box to the back half of the box. We were told that in a metro mirror with 30 kilometer separation in full Synchronous mode, the delay could be up to .08 ms on writes. Since our loop back metro mirror is approximately 3ft, our delay is less than .03 ms. on writes. Thanks for the details on your normal daily backup cycle. I just have one question. The difference between .08 ms. and .03 ms. is .05 ms., or 50 microseconds. Do you really need to reduce write elapsed time by that small an amount at the cost of having your secondary mirror devices in the same room as your primary devices? You must be seriously write-intensive with very low I/O service times for 50 microseconds to be a large increment in service time. Bill Fairchild Rocket Software
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