In fact the disk system didn't change with our migration. The VMWare farm was run against the same IBM DS8000 the z used. Most of the DS8000 space was used for open systems anyway. If memory serves me right before the DS8000 went out the door we had 48 disk sets in it and only 6 were used for the z. And the x86 world was connected by the same Cisco SAN switches that were used for connecting the open storage on the z. But a world of difference in resulting performance.
best regards, Pieter Harder ________________________________________ Van: Linux on 390 Port <[email protected]> namens Philipp Kern <[email protected]> Verzonden: dinsdag 2 februari 2016 22:24 Aan: [email protected] Onderwerp: Re: TCO comparison Intel vs EC12 IFLs 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 [email protected] 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 [email protected] 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/
