On Friday, 09/24/2010 at 09:06 EDT, George Henke/NYLIC <george_he...@newyorklife.com> wrote: > Why now the need Expanded Storage in the VM world to accommodate LINUX guests > when Expanded Storage in the MVS world is a thing of the past?
Because the system performs better when you have it. z/VM was designed for overcommittment of memory and expanded storage helps it do that. Even if it isn't intuitive, it's nonetheless true. If z/VM Development says "You need expanded storage" then that's your starting point. Through performance measurement and analysis you can tune the balance of central and expanded storage to optimize your workloads. MVS and VM are different operating systems, so it shouldn't surprise anyone that they have different design points and objectives. And in any case, MVS' choice to not use expanded storage doesn't have anything to do with VM except to eliminate the need to attach xstore to MVS guests. Alan Altmark z/VM and Linux on System z Consultant IBM System Lab Services and Training ibm.com/systems/services/labservices office: 607.429.3323 alan_altm...@us.ibm.com IBM Endicott
