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With the z10 EC, signifi cant steps have been taken in the
area of server availability with a focus on reducing pre-
planning requirements. Pre-planning requirements are min-
imized by delivering and reserving 16 GB for HSA so the
maximum confi guration capabilities can be exploited. And
with the introduction of the ability to seamlessly include
such events as creation of LPARs, inclusion of logical
subsystems, changing logical processor defi nitions in an
LPAR, and the introduction of cryptography into an LPAR.
Features that carry forward from previous generation pro-
cessors include the ability to dynamically enable I/O, and
the dynamic swapping of processor types.
Hardware System Area (HSA)
Fixed HSA of 16 GB is provided as standard with the z10
EC. The HSA has been designed to eliminate planning for
HSA. Preplanning for HSA expansion for confi gurations will
be eliminated as HCD/IOCP will, via the IOCDS process,
always reserve:
• 4 Logical Channel Subsystems (LCSS), pre-defi ned
• 60 Logical Partitions (LPARs), pre-defi ned
• Subchannel set 0 with 63.75k devices
• Subchannel set 1 with 64K-1 devices
• Dynamic I/O Reconfi guration – always enabled by
default
• Concurrent Patch - always enabled by default
• Add/Change the number of logical CP, IFL, ICF, zAAP,
zIIP, processors per partition and add SAPs to the con-
fi guration
• Dynamic LPAR PU assignment optimization CPs, ICFs,
IFLs, zAAPs, zIIPs, SAPs
• Dynamically Add/Remove Crypto (no LPAR deactivation
required)
Enhanced Book Availability
With proper planning, z10 EC is designed to allow a
single book, in a multi-book server, to be non-disrup-
tively removed from the server and re-installed during an
upgrade or repair action. To minimize the effect on current
workloads and applications, you should ensure that you
have suffi cient inactive physical resources on the remain-
ing books to complete a book removal.
For customers confi guring for maximum availability we rec-
ommend to purchasing models with one additional book.
To ensure you have the appropriate level of memory, you
may want to consider the selection of the Flexible Memory
Option features to provide additional resources when
completing an Enhanced Book Availability action or when
considering plan ahead options for the future. Enhanced
Book Availability may also provide benefi ts should you
choose not to confi gure for maximum availability. In these
cases, you should have suffi cient inactive resources on
the remaining books to contain critical workloads while
completing a book replacement. Contact your IBM rep-
resentative to help you determine and plan the proper
confi guration to support your workloads when using non-
disruptive book maintenance.
Enhanced Book Availability is an extension of the support
for Concurrent Book Add (CBA) delivered on z990. CBA
makes it possible to concurrently upgrade a server by
integrating a second, third, or fourth book into the server
without necessarily affecting application processing. The
following scenarios prior to the availability of EBA would
require a disruptive customer outage. With EBA these
upgrade and repair procedures can be performed concur-
rently without interfering with customer operations.
Availability Functions
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