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and provide the clock signal to the system transparently,
with no system outage. Previously, in the event of a failure
of the active oscillator, a system outage would occur, the
subsequent system Power On Reset (POR) would select
the backup, and the system would resume operation.
Dynamic Oscillator Switchover is exclusive to System z10
EC and System z9.
Transparent Sparing
The z10 EC offers two PUs reserved as spares per server.
In the case of processor failure, these spares are used
for transparent sparing. On z10 EC sparing happens on
a core granularity rather than chip granularity as on z990
and System z9 (for which “chip” equaled “2 cores”).
Concurrent Maintenance
Concurrent Service for I/O features: All the features that
plug into the I/O Cage are able to be added and replaced
concurrent with system operation. This virtually eliminates
any need to schedule outage for service to upgrade the
I/O subsystem on this cage.
Upgrade for Coupling Links: z10 EC has concurrent
maintenance for the ISC-3 daughter card. Also, Coupling
Links can be added concurrently. This eliminates a need
for scheduled downtime in the demanding sysplex envi-
ronment.
Cryptographic feature: The Crypto Express2 feature
plugs in the I/O cage and can be added or replaced con-
currently with system operation.
Redundant Cage Controllers: The Power and Service
Control Network features redundant Cage Controllers for
Logic and Power control. This design enables non-disrup-
tive service to the controllers and virtually eliminates cus-
tomer scheduled outage.
Auto-Switchover for Support Element (SE): The z10
EC has two Support Elements. In the event of failure on
the Primary SE, the switchover to the backup is handled
automatically. There is no need for any intervention by the
Customer or Service Representative.
Concurrent Memory Upgrade
This function allows adding memory concurrently, up to
the maximum amount physically installed. In addition,
the Enhanced Book Availability function also enables a
memory upgrade to an installed z10 EC book in a multi-
book server.
Plan Ahead Memory
Future memory upgrades can now be preplanned to be
non-disruptive. The preplanned memory feature will add
the necessary physical memory required to support target
memory sizes. The granularity of physical memory in the
System z10 design is more closely associated with the
granularity of logical, entitled memory, leaving little room
for growth. If you anticipate an increase in memory require-
ments, a “target” logical memory size can now be speci-
fi ed in the confi guration tool along with a “starting” logical
memory size. The confi guration tool will then calculate the
physical memory required to satisfy this target memory.
Should additional physical memory be required, it will be
fulfi lled with the currently available preplanned memory
features.
The preplanned memory feature is offered in 16 gigabyte
(GB) increments. The quantity assigned by the confi gu-
ration tool is the number of 16 GB blocks necessary to
increase the physical memory from that required for the
“starting” logical memory to the physical memory required
for the “target” logical confi guration. Activation of any pre-
planned memory requires the purchase of a preplanned
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