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Transparent Sparing
z890 offers a 5 PU MCM in the case of processor failure. If
there is a spare PU available it will be used for transparent
sparing. Note this can only be achieved on 1-way, 2-way
and 3-way models.
Enhanced Dynamic Memory Sparing
The z890 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: z890 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: z890 has concurrent main-
tenance for the ISC-3 adapter card. Also, Coupling links
can be added concurrently. This virtually eliminates a
need for scheduled downtime in the demanding sysplex
environment.
• Cryptographic Cards: The PCIXCC and PCICA cards
plug in the I/O cage and can be added or replaced
concurrently with system operation.
• Redundant Cage Controllers: The Power and Service
Control Network features redundant Cage Controllers for
Logic and Power control. This design enables nondis-
ruptive service to the controllers and virtually eliminates
customer scheduled outage.
• Auto-Switchover for Service Element: The z890 has two
Service Elements. In the event of failure on the Primary
SE, the switchover to the backup is handled automati-
cally. There is no need for any intervention by the cus-
tomer or Service Representative.
Concurrent Capacity BackUp Downgrade (CBU Undo)
This function allows the customer to downgrade the disas-
ter backup machine to its normal confi guration without
requiring the PowerOn Reset (POR).
Fault Tolerant Interconnect Design: The memory design of
the z890 provides a fault tolerant dual interconnect fabric.
The z890 is designed to prevent a single failure within the
fabric from disrupting full memory access.
Concurrent Capacity Upgrade: A z890 can be upgraded
via the concurrent addition of additional Processor Units
(PUs) and I/O and limited memory upgrades (24 Gb to 32
Gb increment) with no disruption to current operations.
However, while capacity upgrades to the processor itself
are concurrent, your software may not be able to take
advantage of the increased capacity without performing
an Initial Programming Load (IPL).
Advanced Availability Functions