IBM 990 - Manual (Page 203)

Chapter 8. Capacity upgrades 191
Code Configuration Control (LIC-CC) only or also by installing additional book(s) and/or I/O
card(s):
CUoD upgrades for processors are done by either:
– LIC-CC assigning and activating spare PUs up to the limit of the current installed
book(s)
– Installing additional book(s) and LIC-CC assigning and activating spare PUs on
installed book(s)
CUoD upgrades for memory are done by either:
– LIC-CC activating additional memory capacity up to the limit of the memory cards on
the current installed book(s)
– Installing additional book(s) and LIC-CC activating additional memory capacity on
installed book(s)
CUoD upgrades for I/O are done by either:
– LIC-CC activating additional ports on already installed ESCON and ISC-3 cards
– Installing additional I/O card(s) and supporting infrastructure if required on already
installed I/O cage(s)
CUoD is ordered as a “normal” upgrade, also known as Miscellaneous Equipment
Specification (MES).
CUoD does not require any special contract, but requires IBM service personnel for the
upgrade. In most cases, a very short period of time is required for the IBM personnel to install
the LIC-CC and complete the upgrade.
To better exploit the CUoD function, an initial configuration should be carefully planned to
allow a concurrent upgrade up to a target configuration.
You need to consider planning, positioning, and other issues to allow a CUoD nondisruptive
upgrade. By planning ahead, it is possible to enable nondisruptive capacity and I/O growth for
the z990 with no system power down and no associated POR or IPLs.
The Plan Ahead feature involves pre-installation of additional I/O cage(s), as it is not possible
to install an I/O cage concurrently.
CUoD for processors
CUoD for processors can add, concurrently, more CPs, IFLs, ICFs, and zAAPs to a z990
server by assigning available spare PUs via LIC-CC. Depending on the quantity of the
Important: If the z990 STI Rebalance feature (FC 2400) is selected at server upgrade
configuration time, and effectively results in STI rebalancing, the server upgrade will be
disruptive and this outage must be planned. The STI rebalancing operation may also be
done independently of a model upgrade.
The z990 STI Rebalance feature may also change the Physical Channel ID (PCHID)
number of ICB-4 links, requiring a corresponding update on the server’s I/O definition via
HCD or HCM.
Note: CUoD basically provides a “physical” concurrent upgrade, resulting in more enabled
processors, memory, and/or I/O ports available to a server configuration. Thus, additional
planning and tasks are required for
nondisruptive “logical” upgrades (see
“Recommendations to avoid disruptive upgrades” on page 217).