IBM eServer zSeries 900 Technical Guide

38 IBM eServer zSeries 900 Technical Guide

– A Model 210 with 2 IFLs has 5 spare PUs, it can be upgraded concurrently up to Model

214 and can have up to 4 CBU features.

3. z900 Model 2C8 configuration:

– A z900 Model 2C8 uses the turbo 20-PU MCM, with 8 CPs and 3 SAPs. This capacity

model can have up to 8 CBU features.

– The standard configuration has 9 spare PUs, and can be upgraded concurrently up to

Model 216.

– A Model 2C8 with 1 ICF has 8 spare PUs, it can be upgraded concurrently up to Model

215 and can have up to 7 CBU features.

Note that the number of spare PUs defines how many CPs, ICFs, and IFLs can be added on

future upgrades. When hardware changes are

not required, processor upgrades can be

concurrent via CUoD, CIU or CBU (remember that CBU can only add CPs). Image (logical)

upgrades can be nondisruptive if

previously configured with reserved processors. See 6.5,

“Nondisruptive upgrades” on page 219 for details.

Adding more logical partitions to an existing configuration is

disruptive, because a Power-On-

Reset must be executed using a new IOCDS having the new partitions added.

2.4.4 Hardware Management Console

All z900 models include a Hardware Management Console (HMC) and two internal Support

Elements (SEs).

On z900 servers the HMC provides the platform and user interface that can control and

monitor the status of the system. The SEs are basically used by IBM service representatives.

More than one HMC can be ordered, providing more flexibility and additional points of control.

The HMC can also provide a single point of control and single system image for a number of

CPCs configured to it.

The internal SEs for each CPC are attached by local area network (LAN) to the HMC, and

allow the HMC to monitor the CPC by providing status information. Each internal SE provides

the HMC with operator controls for its associated CPC, so you can target operations in

parallel to multiple or all CPCs, or to a single CPC.

The second SE, called Alternate SE, is standard on all z900 models and serves as a back-up

to the primary SE. Error detection and automatic switch-over between the two redundant SEs

provides enhanced reliability and availability. There are also two fully redundant interfaces,

known as the Power Service Control Network (PSCN), between the two SEs and the CPC.

See more details about the HMC and SEs on Appendix B, “Hardware Management Console

and Support Element” on page 251.

2.4.5 Frames

The z900 frames are enclosures built to Electronic Industry Association (EIA) standards. The

z900 servers can have up to three frames, depending on the channel configuration and the

battery backup option.

All z900 servers have one

A Frame and optionally one Z Frame and/or one B Frame

(Figure 2-7). The A and Z frames contain two cage positions (top and bottom).

Chapter 2. zSeries 900 system structure 39

Figure 2-7 Frames

A frame

The A frame contains the CPC cage on the top, with its Modular Cooling Units (MCUs), and

one I/O cage on the bottom.

The I/O cage of the A frame is the zSeries I/O cage Feature Code 2023 (FC 2023), which can

house any channel cards

except parallel channel cards, ESCON 4-port channel cards, and

OSA-2 cards. It can have up to 256 ESCON channels or up to 32 FICON channels.

Z frame

The optional Z frame is attached to the A frame and contains up to two I/O cages, one at the

top and one on the bottom. The Z frame is included on a z900 server when the A frame I/O

cage is not enough to hold all channel cards required by the I/O configuration.

The Z frame’s I/O cages can be either zSeries I/O cages (FC 2023) or compatibility I/O cages

(FC 2022), in any mix. The compatibility I/O cage FC 2022 can house only parallel channel

cards, ESCON 4-port channel cards, and OSA-2 cards.

Table 2-5 shows the possible combinations of the zSeries (FC 2023) and compatibility (FC

2022) I/O cage positions in the Z frame.

Table 2-5 Z frame I/O cages positions

Z frame top Z frame bottom

FC 2023 -

- FC 2022

FC 2022 FC 2022

FC 2023 FC 2022

FC 2023 FC 2023

B Frame

Z Frame

A Frame

Internal Battery

Feature (IBF)

Central Process

Complex (CPC)

Cage

I/O Cages