IBM manual z890 I/O Subsystem, z890s Positioning in the zSeries Family, z890 Cage Layout

z890 I/O Subsystem

MSUs and SRM constants. The z990 default mixed work- load will be composed of equal amounts of fi ve workloads, Trade2-EJB, WEB/CICS/DB2, IMS, CB84 and CBW2. Addi- tionally, the z890/z990 LSPR will rate all z/Architecture pro- cessors running in LPAR mode and 64-bit mode. The existing z900 processors have all been re-measured using the new workloads – all running in LPAR mode and 64-bit mode.

Using the new LSPR ‘default mixed workload' for z/OS 1.4, and with all processors executing in 64-bit and LPAR mode, the following results have been achieved:

•Comparing a one-way z800 Model 001 to a one-way z890 Model A04 170, it is estimated that the z890 model has 2.0 times the capacity of z800 Model 001.

•Comparing a two-way z800 Model 002 to a two-way z890 Model A04 270, it is estimated that the z890 model has 2.1 times the capacity of z800 Model 002.

•Comparing a three-way z800 Model 003 to a three-way z890 Model A04 370, it is estimated that the z890 model has 2.1 times the capacity of z800 Model 003.

•Comparing a four-way z800 Model 004 to a four-way z890 Model A04 470, it is estimated that the z890 model has 2.1 times the capacity of z800 Model 004.

z890's Positioning in the zSeries Family

z990
z890	z900 and z990
	> 2550 MIPs
	z900
z800
MP3000	9672
MP
2000
MIPs

Note: Expected performance improvements are based on hard- ware changes. Additional performance benefi ts may be obtained as the z/Architecture is fully exploited.

The z890 contains an I/O subsystem infrastructure which uses an I/O cage that provides 28 I/O slots. Each I/O cage has seven I/O domains with four features in each I/O domain, and each domain has one STI for connectivity to support each I/O cage. ESCON, FICON Express, FICON Express2, OSA-Express, OSA-Express2 and Crypto Express2 features plug into the z890 I/O cage along with any ISC-3s and STI-3 distribution cards, and PCICA and PCIXCC cryptographic features. All I/O cards and their support cards can be hot-plugged in the I/O cage. The z890 provides approximately a 78 percent increase in I/O bandwidth provided by the STIs when compared to the z800.

z890 Cage Layout

A-Frame

CEC

I/O

Cage

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