On Wednesday, 05/10/2006 at 09:51 MST, "Schuh, Richard" <[EMAIL PROTECTED]> wrote: > It is possible to have a memory error that only affects one user. However, that > is rare, almost as rare as having one that affects the entire system. Some of > IBM?s memory chips has the ability to correct 1, 2, 3, and 4 bit errors and > even an entire memory chip. See > http://www-5.ibm.com/hu/termekismertetok/xseries/dn/chipkill.pdf. I would > surmise that the only ones who see memory errors anymore are those who read the > EREP reports and decide that a card needs to be replaced.
Though to answer the original question, if an *unrecoverable* memory error occurs due to a guest reference (i.e. while in SIE), then the machine check is reflected to the guest. CMS, for example, will go casters-up. If the error occurs because of a CP reference to the memory location (i.e not in SIE) then CP will abend. If it's a guest reference, CP is still running and so CP will try to clear the condition. If it can't, then CP will avoid the page frame. Due to the sheer number of page references, a guest is far more likely to hit a memory error than CP. Alan Altmark z/VM Development IBM Endicott
