Do you know if the test is to see if the path has 'transport mode' yes ? In our case, I believe that transport mode showed yes for the dasd paths -- even though microcode levels weren't sufficient on the HW to support HPF and created errors on Linux. So this option doesn't really serve to disable it if that's what you want to do... unless z/VM has a better test that HPF is actually working correctly with CHPIDV ONE :-)
Scott Rohling On Tue, Nov 5, 2013 at 3:36 PM, Michael O'Reilly <mik...@us.ibm.com> wrote: > > Ann, > > There's a new feature on z/VM 6.2, that defines a CHPID appropriate for > virtualization, named CHPIDV. Once you define that (OPTION CHPIDV ONE), > z/VM will test the possibility of using zHPF outside the Guest: if the > environment is appropriate, TCW calls will be made; if not, CCW (non zHPF) > I/O calls will be used. > > Mike O'Reilly > IBM Linux Change Team > > > > > > > "Smith, Ann (CTO > Service > Delivery)" To > <ann.smith@thehar LINUX-390@vm.marist.edu, > tford.com> cc > Sent by: Linux on > 390 Port Subject > <linux-...@vm.mar zHPF with zVM and zlinux servers > ist.edu> > > > 11/05/2013 02:20 > PM > > > Please respond to > Linux on 390 Port > <linux-...@vm.mar > ist.edu> > > > > > > > Looking for info on zHPF High Performance Ficon for z. > There appear to be hardware requirements. Firmware levels on most FICON > EXPRESS cards though FICON EXPRESS 8S may have new hardware feature. > Microcode on DS8100, DS8300 dasd also required. > > Looks like a zVM 6.2 apar VM65041provides support for guests but there is > no command to disable it on zVM. The 'CP QUERY PATHS TO dasddev' can show > if it is enabled. > > Found doc on disabling it on SLES11 servers. (dasd_mod.dasd=nofcx parm in > zipl.conf and load parm at boot). > Looking for similar doc for RHEL6. > Also since SLES10 and RHEL5 do not have zHPF support is it correct that > servers at these older OS levels would continue to run fine even if zHPF > support for guests is enabled by the zVM 6.2 apar. > > Ann Smith > > > > > > ************************************************************ > This communication, including attachments, is for the exclusive use of > addressee and may contain proprietary, confidential and/or privileged > information. If you are not the intended recipient, any use, copying, > disclosure, dissemination or distribution is strictly prohibited. If you > are not the intended recipient, please notify the sender immediately by > return e-mail, delete this communication and destroy all copies. > ************************************************************ > > ---------------------------------------------------------------------- > For LINUX-390 subscribe / signoff / archive access instructions, > send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or > visit > http://www.marist.edu/htbin/wlvindex?LINUX-390 > ---------------------------------------------------------------------- > For more information on Linux on System z, visit > http://wiki.linuxvm.org/ > > > ---------------------------------------------------------------------- > For LINUX-390 subscribe / signoff / archive access instructions, > send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or > visit > http://www.marist.edu/htbin/wlvindex?LINUX-390 > ---------------------------------------------------------------------- > For more information on Linux on System z, visit > http://wiki.linuxvm.org/ > > ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
