On 2016-02-02 14:54, Harder, Pieter wrote:
I think there is another factor involved. On x86 you usually run database engines etc with very large caches to avoid going to disk. On z this is much less of a penalty because of the powerful I/O subsystem. I have some experience with this as we moved our SAP systems from z to x86 as part of a strategic directive to focus on one platform. We ended up running the same systems with about ten times the amount of memory on the databases to get like performance. Both platforms were virtualized (Linux on zVM with DB2 versus Windows on VMWare with MSSQL).
But is it really the capability of the I/O subsystem or is it just that the storage racks needed for the z are much more beefy than the Netapps you usually get for "distributed" virtualization? I do buy that there's more bandwidth available / less latency, although a lot of that depends on how you connect the storage on x86. Kind regards and thanks Philipp Kern ---------------------------------------------------------------------- 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/
