ZSeries

IBM e(logo)server zSeries 900 family: is the name for the S/390 family since December 2001.

• is using z/Architecture (64-bit real and virtual addresses).
• it offers up to 640-processors in a 32 way Sysplex (512 performing workloads and up to 128 performing system and backup functions).
• it supports Linux, z/VM[?] and z/OS operating systems.
• S/390 ESA applications are fully compatible with z/Architecture.

IBM e(logo)server zSeries 800 family :

• to summarize

• http://www.ibm.com/servers/eserver/zseries/