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the processors in the takeover site to acquire processing
power required to restart mission-critical production work-
loads. GDPS-CBU management helps to minimize manual
customer intervention and the potential for errors, which
can help reduce the outage time for critical workloads from
hours to minutes. Similarly, GDPS-CBU management can
also automate the process of dynamically returning the
reserved CPs when the temporary period has expired.
z990 Server Customer Initiated Upgrade (CIU)
Customer Initiated Upgrade (CIU) is the capability to initi-
ate a processor and/or memory upgrade when spare PUs/
installed unused memory are available via the Web using
IBM Resource Link. Customers will be able to download
and apply the upgrade using functions on the Hardware
Management Console via the Remote Support Facility.
This unique and important function for zSeries gives the
customer greater control and ability in adding capacity to
the system to meet resource requirements for unpredict-
able e-business workloads and for applications which
are diffi cult to size. CIU is a low-risk, well tested-and-tried
function.
Transparent Sparing
z990 offers a 12 PU MCM with 2 PUs reserved as spares.
In the case of processor failure, these spares are used for
transparent sparing.
Enhanced Dynamic Memory Sparing
The z900 has enhanced this robust recovery design with
16 times more chips available for sparing. This will virtually
eliminate the need to replace a memory card due to DRAM
failure.
Enhanced Storage Protect Keys: z990 has enhanced the
memory storage protect key design by adding a third key
array to each memory card. The arrays are parity checked
and employ a Triple Voting strategy to assure accuracy.
This will reduce the need for memory card replacement
due to key array failure.
ESCON Port Sparing: The ESCON 16-port I/O card is
delivered with one unused port dedicated for sparing in
the event of a port failure on that card. Other unused ports
are available for nondisruptive growth of ESCON channels.
Concurrent Maintenance
• Concurrent Service for I/O Cards: All the cards which
plug into the new I/O Cage are able to be added and
replaced concurrent with system operation. This virtually
eliminates any need to schedule outage to service or
upgrade the I/O subsystem on this cage.
• Upgrade for Coupling Links: z990 has concurrent main-
tenance for the ISC-3 adapter card. Also, Coupling Links
can be added concurrently. This eliminates a need for
scheduled downtime in the demanding sysplex environ-
ment.
Advanced Availability Functions