In a message dated 12/18/2007 10:19:33 A.M. Central Standard Time, [EMAIL PROTECTED] writes: >There is something that needs to be configured on the machine in order to exploit PAV? Yes, but I am not a sysprog and don't know all that's involved. There are three types of PAV now, with different ways to set them up: (1) the original, which required a hardware definition change; (2) letting WLM manage them, but first you have to define at least one available PAV for WLM to work with, which means a hardware definition change; (3) HyperPAV, where IOS grabs a PAV, if one is needed and one is available, for every incoming I/O, but first you have to define at least one alias for IOS to work with, which means a hardware definition change. >The system programmer needs to set up aliases to certain devices as a tuning exersize based on bottlneck volumes etc. Yes. >Unless that's been done you can't take advantage of anything? Correct. >Or will z/OS dynamically decide that there's a lot of contention for that device so a couple of aliases would be a good idea. I don't know of any way in which z/OS will tell you how many PAVs you need in order to make things better. There may be some performance monitors that do that. z/OS will only work with aliases if you first define some. >Manual tuning seems the norm on mainframes as far as I can tell, so I'd guess the former (forgive my ignorance of such things. Manual can be done, but HyperPAVs let tuning be done automatically and instantaneously by IOS. WLM can also do things automatically, but not instantaneously. >My background is very much PC and distrubuted platforms and I'm trying to understand the possibilitied for mainframe I/O and what's involved in making use of them). Welcome to our parallel universe. :-) Bill Fairchild Franklin, TN
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