>[EMAIL PROTECTED] (Kopischke, David G.) writes: > From what I understand, we just use canned processes to extract > SMF, load databases and create reports. But since we don't use VM > at home and have no experience with it, maybe we're just not > understanding where this data is in that environment ??? Is there > any documentation that specifies what SMF data is available under > VM and what is not ??? With respect to %CPU BUSY, I understand it's > virtual under VM, but there still has to be some method of gauging > how much CPU a guest is using, isn't there ??? How do VM shops > report this ???
>From the deep dark recesses of my memory <G> IIRC, the MVS CPU busy is not measured directly determined by sampling the PSW wait bit and subtracting from 100%. In a z/VM environment, the (guest image) PSW wait bit is maintained by z/VM, either always on or always off from the standpoint of the VM guest image. Thus any sampling of this bit will yield either 100% busy or 0% busy. z/VM (of course), knows the correct answer and can report on this via the z/VM equivalent of RMF. I forget what this is called. I also seem to recall that there was a method for z/VM to properly maintain this bit but it was not the default. i.e. the z/VM sysprog needed to modify the guest machine definition to make this happen. This still involves the capture ratio issues discussed by Lynn Wheeler. Maybe someone with more recent VM experience can chip in and help me out here? HTH, ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
