IBM 990 1.3.12 Concurrent upgrades

6947ch01.fm Draft Document for Review April 7, 2004 6:15 pm

16 IBM eServer zSeries 990 Technical Guide

The z990 server implements two fully redundant interfaces, known as the Power Service

Control Network (PSCN), between the two Support Elements and the CPC. Error detection

and automatic switch-over between the two redundant Support Elements provides enhanced

reliability and availability.

1.3.12 Concurrent upgrades

The z990 servers have concurrent upgrade capability via the Capacity Upgrade on Demand

(CUoD) function. This function is also used by Customer Initiated Upgrades (CIUs) and by the

Capacity BackUp (CBU) feature implementation; following are more details.

Capacity Upgrade on Demand offers server upgrades via Licensed Internal Code (LIC)

enabling. CUoD can concurrently add processors (CPs, IFLs, ICFs, or zAAPs), and memory

to an existing configuration when no hardware changes are required, resulting in an upgraded

server. Also I/O features can be added concurrently.

However, adequate planning is required. Proper models and memory card sizes must be

used, and the Plan Ahead feature with concurrent conditioning enablement is recommended

in order to ensure that all required infrastructure components are available.

Customer Initiated Upgrades are Web-based solutions for customers ordering and installing

upgrades via IBM Resource Link and the z990 Remote Support Facility (RSF). A CIU

requires a special contract and registration with IBM. The CIU uses the CUoD function to

allow concurrent upgrades for processors (CPs, IFLs, ICFs, and zAAPs), and memory,

resulting in an upgraded server.

As a CUoD, it also requires proper planning with respect to z990 model and memory card

sizes. CIU is not available for I/O upgrades.

On/Off Capacity on Demand (On/Off CoD) for z990 gives the customer the ability to

temporarily turn on unowned PUs available within the current model. This capability allows

customers to add capacity (CPs, IFLs, ICFs, and zAAPs) temporarily to meet peak workload

demands.

The customer has to accept contractual terms for On/Off CoD to use this capability; activation

of the additional capacity uses the CIU process. The usage is monitored and customer incurs

additional charges for both the hardware and software until the added capacity is deactiva ted.

Capacity BackUp (CBU) is a temporary upgrade for customers who have a requirement for a

robust disaster/recovery solution. It requires a special contract with IBM. CBU can

concurrently add CPs to an existing configuration when another customer’s servers are

experiencing unplanned outages.

Note: The On/Off CoD capability can coexist with Capacity BackUp (CBU) enablement.

Both On/Off CoD and CBU LIC-CC can be installed on a z990 server, but the On/Off CoD

activation and CBU activation are mutually exclusive.