IBM Z10 EC User Manual download pdf (Page 44)

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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IBM Z10 EC User Manual Page 44

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