IBM 990 - Manual (Page 199)

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Chapter 8.
Capacity upgrades
This chapter describes the zSeries 990 server’s capacity upgrade functions and features. It
also includes capacity measurements and performance considerations.
The z990 servers have the capability of concurrent upgrades, without a server outage, in both
planned and unplanned situations.
In most cases, a z990 capacity upgrade can also be nondisruptive , without a system outage.
The following sections are included:
8.1, “Concurrent upgrades” on page 188
8.2, “Capacity Upgrade on Demand (CUoD)” on page 190
8.3, “Customer Initiated Upgrade (CIU)” on page 196
8.4, “On/Off Capacity on Demand (On/Off CoD)” on page 202
8.5, “Capacity BackUp (CBU)” on page 206
8.6, “Nondisruptive upgrades” on page 210
8.7, “Capacity planning considerations” on page 219
8.8, “Capacity measurements” on page 223
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