IBM 990 - Manual (Page 202)

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zSeries 990 Technical Guide
On/Off CoD can concurrently add processors (CPs, IFLs, ICFs, and zAAPs) up to the limit of
the installed book(s) of an existing server, and is restricted to double the current installed
capacity. On/Off CoD uses the CIU ordering process, initiated by the customer via the Web
using IBM Resource Link, and makes use of CUoD techniques. On/Off CoD requires a
special contract.
Unplanned upgrades
Unplanned upgrades can be done by the Capacity BackUp (CBU) for emergency or
disaster/recovery situations.
CBU is a concurrent and temporary activation of Central Processors (CPs) in the face of a
loss of customer processing capacity due to an emergency in any customer’s zSeries or
S/390 server or servers at any sites or locations. CBU
cannot be used for peak load
management of customer workload. A CBU activation can last up to 90 days when a
disaster/recovery situation occurs.
CBU features, one for each “standby” CP, are optional on z990 servers and require spare
PUs on installed book(s) of the existing server. A CBU contract must be in place before the
special code that enables this capability can be loaded on the customer server.
Capacity upgrade functions
Table 8-1 summarizes the capacity upgrade functions available for z990 servers.
Table 8-1 Capacity upgrade functions summary
8.2 Capacity Upgrade on Demand (CUoD)
Capacity Upgrade on Demand (CUoD) is a function available on z990 servers that enables
concurrent and permanent capacity growth.
The CUoD function is based on the Configuration Reporting Architecture, which provides
detailed information on system-wide changes, such as the number of configured Processor
Units, system serial numbers, and other information.
CUoD provides the ability to concurrently add processors (CPs, IFLs, ICFs, and zAAPs),
memory capacity, and I/O ports. The concurrent upgrade can be done by Licensed Internal
Function Upgrades Via Type Process
CUoD CPs, IFLs, ICFs,
and zAAPs
Memory
I/O LIC
or
hardware installation Concurrent and
permanent Ordered as an normal
upgrade and activated
by IBM
CIU CPs, IFLs, ICFs,
and zAAPs
Memory LIC-only
cannot add book Concurrent and
permanent Initiated via Web and
activated by customer
On/Off
CoD CPs, IFLs, ICFs,
and zAAPs LIC-only
cannot add book Concurrent and
temporary
(no time limit) Initiated via Web and
activated by customer
CBU CPs LIC-only
cannot add book Concurrent and
temporary
(up to 90 days) Ordered for
backup/recovery only
and activated by
customer