Model Upgrades

Although CBU and On/Off Capacity on Demand can both reside on the server, the activation of On/Off Capacity on Demand is mutually exclusive with Capacity BackUp (CBU) and no physical hardware upgrade will be sup- ported while On/Off Capacity on Demand is active.

This important new function for zSeries gives customers greater control and ability to add capacity to meet the requirements of an unpredictable on demand applica- tion environment. On/Off CoD extends zSeries capacity on demand offerings to the next level of ﬂ exibility. It is designed to help customers match cost with capacity utilization and manage periodic business spikes. On/Off Capacity on Demand is designed to provide a low-risk way to deploy pilot applications, and it is designed to enable a customer to grow capacity rationally and proportionately with market demand.

Customers can also take advantage of Capacity Upgrade on Demand (CUoD), Customer Initiated Upgrade (CIU), and Capacity BackUp (CBU) which are described later in the document.

The z990 has also been designed to offer a high perfor- mance and efﬁ cient I/O structure. All z990 models ship with two frames the A-Frame and the Z-Frame; this sup- ports the installation of up to three I/O cages. Each I/O cage has the capability of plugging up to 28 I/O cards. When used in conjunction with the software that supports Logical Channel SubSystems, it is possible to have up to 420 ESCON® channels in a single I/O cage and a maxi- mum of 1024 channels across 3 I/O cages. Alternatively, three I/O cages will support up to 120 FICON™ channels

and up to 360 ESCON channels. Each book will support up to 12 STIs for I/O connectivity. Seven STIs are required to support the 28 channel slots in each I/O cage so in order to support a fully conﬁ gured three I/O cage system 21 STIs are required. To achieve this maximum I/O con- nectivity requires at least a B16 model which provides 24 STIs.

The following chart shows the upgrade from z900 to z990. There are any to any upgrades from any of the z900 gen- eral purpose models. A z900 Coupling Facility Model 100 must ﬁ rst be upgraded to a z900 general purpose model before upgrading to a z990. There are no upgrades from 9672 G5/G6 or IBM ^zSeries 800 (z800).

z900

z990

100

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