No need to run with MACHINE XC. The underlying diagnose has been changed with z/VM 4.3. SLES8 will attempt PFAULT, if it fails it will try PAGEX (it will issue SET PAGEX ON).
-----Original Message----- I see (via "make xconfig") in SLES8 that Pseudo Page Fault support is enabled. The associated help says that if the PFAULT macro cannot be used then PAGEEX (sic) will be used. However, to use PFAULT the virtual machine must be in XC-mode operation, according to the IBM CP Programming Services manual. The SLES8 install doc shows a sample directory entry with MACHINE ESA specified. Also, when I issue a CP QUERY SET it shows that PAGEX is OFF. I gather from these facts that Pseudo Page Fault support must not be actually in use. Some questions: - Should we be running with MACHINE XC specified in the directory entry for the SLES8 servers? - If not running MACHINE XC, should I be specifying SET PAGEX ON before booting SLES8? - Finally, and more generally, should I even bother? That is, will Pseudo Page Fault support make running SLES8 faster?
