On Saturday, 02/27/2016 at 08:59 GMT, Kirk Bradley <kbrad...@mac.com> wrote: > Right.. a CMS dump helper is what I had in mind.. maybe you SMSG it to take a > dump of another guest.. something like that. > > My real problem is that VMDUMP is so horrible that IBM needs to fix it - make > another command / subsystem / "I don?t care what? that can fully utilize the > I/O power of a mainframe .. and it works against all guests just like VMDUMP. > Why does each OS need to have it?s own way of doing that. Otherwise why would > VMDUMP have been written in the first place?
Yes, you might be able to write a CMS dump helper. The question is why would you? The Linux folks have to have a dump program that works with or without VM. Same for the other OSes. And the SA dump programs are built with knowledge of how the OS organizes memory. As it happens, VM and Linux now use the same dump program. VMDUMP was written in a kinder, gentler era. Virtual machines were small. VMDUMP got its job done in an acceptable amount of time, and it's still fine for CMS and GCS dumps. Otherwise, use the OS-specific SA dump program. Since there's already an acceptable method of getting SA dumps from Linux in a reasonable amount of time, there's no business reason to spend resources upgrading VMDUMP. There are other, higher priority items in queue. So build and practice using the new z/VM 6.3 SA dump program before you need it. Do it with Linux, too. If you're fiddling around trying to understand it when the OS is dead, you're going to simply reboot in the interest of time and miss the opportunity to get the dump. All in the hope that it won't happen again. Alan Altmark Senior Managing z/VM and Linux Consultant Lab Services System z Delivery Practice IBM Systems & Technology Group ibm.com/systems/services/labservices office: 607.429.3323 mobile; 607.321.7556 alan_altm...@us.ibm.com IBM Endicott ---------------------------------------------------------------------- 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/
