IBM 990 User Manual
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IBM
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zSeries 990 Technical Guide
When the emergency is over (or the CBU test is complete), the server must be taken back to
its original, permanent configuration. The CBU features can be deactivated by the customer
at any time before the expiration date. Otherwise, the performance of the system will be
degraded after expiration, unless CBU is deactivated.
Software charges based on the total capacity of the server on which the software is installed
would be adjusted to the maximum capacity after the CBU upgrade. See Table 6-3 on
page 148 to check software implications of CUoD, which is used by the CBU upgrade.
Software products using Workload License Charge (WLC) may not be affected by the server
upgrade, as their charges are based on partition’s utilization and not based on the server total
capacity. See 6.8, “Workload License Charges” on page 150 for more information about WLC.
For detailed instructions, refer to the IBM
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zSeries Capacity Backup User’s Guide,
SC28-6810, available on the IBM Resource Link.
Activation/Deactivation of CBU
The activation and deactivation of the CBU function can be initiated by the customer without
the need for the onsite presence of IBM service personnel. The CBU function is activated and
deactivated from the HMC, and in each case it is a nondisruptive task.
CBU activation
Upon request from the customer, IBM can remotely activate the emergency configuration,
eliminating the time associated with waiting for an IBM service person to arrive on site to
perform the activation.
A fast electronic activation is available through the Hardware Management Console (HMC)
and Remote Support Facility (RSF) and could drive activation time down to minutes. The
z990 server invokes the RSF to trigger an automatic verification of CBU authentication at
IBM. This will initiate an automatic sending of the authentication to the customer’s server,
automatic unlocking of the reserved capacity, and activation of the target configuration.
In situations where the RSF cannot be used, CBU can be activated through a password
panel. In this case, a request by telephone to the IBM support center usually enables
activation within a few hours.
The CBU activation cannot be done when an On/Off CoD upgrade is already activated.
Image upgrades
After the CBU activation, the z990 server has more physical CPs available to the operating
system image(s). The logical partition image(s) can concurrently increase the number of
logical CPs by configuring reserved processors online. The operating system must have the
capability to concurrently configure more processors online. If a nondisruptive CBU upgrade
is needed, the same principles of nondisruptive CUoD should be applied.
CBU deactivation
The process of deactivating CBU is simple and straightforward. The process starts by
quiescing the added CPs (normally the highest numbered) from all the logical partitions, and
varying them offline from the operating systems. Then from the HMC CBU activation panel,
perform a concurrent CBU undo.
Note:
CBU for processors provides a “physical” concurrent upgrade, resulting in more
enabled processors available to a server configuration. Thus, additional planning and
tasks are required for
nondisruptive
“logical” upgrades. See “Recommendations to avoid