IBM Systems Magazine, Mainframe - July/August 2014 - 44

ADMINISTRATOR

Ensuring AVAILABILITY
Active/Active Sites helps distribute workloads during outages

A

s enterprises have become more dependent on IT, their continuous availability,
disaster recovery (DR) and business continuity requirements have become more
demanding. Government regulations are more stringent as well.

David Petersen
is an IBM distinguished engineer
for the System z
platform.

In fact, the Federal Reserve
Board, Office of the Comptroller
of the Currency and the Securities and Exchange Commission
specify in their report, "The
Interagency Paper on Sound
Practices to Strengthen the
Resilience of the U.S. Financial
System," that recovery from a
disruption must happen quickly.
"The core clearing and settlement
organizations should develop the
capacity to recover and resume
clearing and settlement activities
within the business day on which
the disruption occurs with the
overall goal of achieving recovery
and resumption within two hours
after an event," the report says
(http://1.usa.gov/1krgPek).
IT outages cost more, too.
Research firm Aberdeen Group
found that between June 2010
and February 2012, the average cost per hour of downtime
increased by 65 percent (http://
bit.ly/1kw4sio). Internet-based
customer interaction and social
media make IT service interruptions widely known very quickly.

A Paradigm Shift
To address today's stringent
requirements, IBM created the
Active/Active (A/A) Sites solution.
A/A Sites is two or more sites
44 // JULY/AUGUST 2014 ibmsystemsmag.com

separated by extended distances
running the same applications and
using the same data to provide
cross-site workload balancing,
continuous availability and DR. It's
a fundamental paradigm shift from
a failover model to a continuous
availability model.
A/A Sites is designed to
largely eliminate planned
outages (e.g., application,
database management system,
software and site maintenance)
while mitigating the impact
of unplanned outages (e.g.,
application and site failures).
There are redundant workload
instances for each workload. Each
workload instance is executing
on a separate sysplex, and the
sysplexes reside in different
regions separated by extended
distances. When planned or
unplanned outages occur, A/A
Sites switches to an alternate
workload instance.
The GDPS*/Active-Active
(GDPS/A-A) product was
developed to implement the A/A
Sites solution. GDPS/A-A control
software manages and monitors
the A/A Sites configuration.
GDPS/A-A can start and stop
sysplexes, workloads and
replication; perform planned
and unplanned workload and

region switches; and manage disk
replication. Additionally, it has
extensive monitoring. When it
detects a condition affecting the
capability to perform workload or
region switches, it generates an
alert about the outstanding issue.
The GDPS/A-A Sites Concept
consists of sysplexes deployed
in two or more regions, with the
same workloads and data objects
(see Figure 1, page 45).
Network connections are routed
to workload instances on each
sysplex by workload distributors
(routers). Most routers support
the needed Server/Application
State Protocol (SASP) protocol.
GDPS/A-A uses SASP to provide
guidance to the routers to route
connections, thereby adding
the capability to switch between
workload instances.
DB2*, IMS* and VSAM
data is synchronized between
sysplexes using software-based
asynchronous replication, which
consists of capture engines and
apply engines. Capture engines
monitor the source database
management system (DBMS) for
committed transactions, which are
replicated from the source DBMS
to the target DBMS, and the apply
engine applies them at the target
DBMS. Typically less than one


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IBM Systems Magazine, Mainframe - July/August 2014

Table of Contents for the Digital Edition of IBM Systems Magazine, Mainframe - July/August 2014

Table of Contents
Editor's Desk: Protecting information
IBM Perspective: Sunny outlook on the mainframe
Techbits: Watson: your personal shopper
Infographic: How the mainframe changed our world
Partner PoV: ISVs can help mainframe customers keep up with a rapidly evolving environment
Focus on Storage: IBM FlashSystem addresses storage and application performance issues
Currents: As data consumption expands, information protection policies must be put in place
Case Study: Credit Where Credit's Due: Isracard Group devises a novel way to verify its system integrity before disaster occurs
Cover Story: A Secure Fortress: The mainframe delivers the reliability, safety and cost-effectiveness your IT shop needs
Feature: Be Proactive in Risk Management: Protecting data is crucial as your business connects in ever-increasing ways along the access superhighway
Feature: Being Risk-Aware: New IBM and Ponemon study examines the economics of IT risk and reputation
Administrator: Active/Active Sites helps distribute workloads during outages
Tech Corner: A point-in-time tool, Runtime Diagnostics can find issues in a pinch
Solutions: Reflection 2014; CA Chorus; VFTP 3.0; Lifecycle Manager; STEPLIB-Rx; Ivory VisualConnect; Mainframe Abend Assist; Linux Enterprise Server Starter System for System z
Stop Run: Together, IBM executives Pat Toole Jr. and Pat Toole St. bring more than half a century of dedication to the company
Reference Point - Global Events, Education, Resources for Mainframe
2014 Mainframe Solutions Edition Product Index
IBM Systems Magazine, Mainframe - July/August 2014 - Intro
IBM Systems Magazine, Mainframe - July/August 2014 - Cover1
IBM Systems Magazine, Mainframe - July/August 2014 - Cover2
IBM Systems Magazine, Mainframe - July/August 2014 - 1
IBM Systems Magazine, Mainframe - July/August 2014 - Table of Contents
IBM Systems Magazine, Mainframe - July/August 2014 - 3
IBM Systems Magazine, Mainframe - July/August 2014 - 4
IBM Systems Magazine, Mainframe - July/August 2014 - 5
IBM Systems Magazine, Mainframe - July/August 2014 - Editor's Desk: Protecting information
IBM Systems Magazine, Mainframe - July/August 2014 - 7
IBM Systems Magazine, Mainframe - July/August 2014 - IBM Perspective: Sunny outlook on the mainframe
IBM Systems Magazine, Mainframe - July/August 2014 - 9
IBM Systems Magazine, Mainframe - July/August 2014 - Techbits: Watson: your personal shopper
IBM Systems Magazine, Mainframe - July/August 2014 - 11
IBM Systems Magazine, Mainframe - July/August 2014 - Infographic: How the mainframe changed our world
IBM Systems Magazine, Mainframe - July/August 2014 - 13
IBM Systems Magazine, Mainframe - July/August 2014 - Partner PoV: ISVs can help mainframe customers keep up with a rapidly evolving environment
IBM Systems Magazine, Mainframe - July/August 2014 - 15
IBM Systems Magazine, Mainframe - July/August 2014 - Focus on Storage: IBM FlashSystem addresses storage and application performance issues
IBM Systems Magazine, Mainframe - July/August 2014 - 17
IBM Systems Magazine, Mainframe - July/August 2014 - 18
IBM Systems Magazine, Mainframe - July/August 2014 - 19
IBM Systems Magazine, Mainframe - July/August 2014 - Currents: As data consumption expands, information protection policies must be put in place
IBM Systems Magazine, Mainframe - July/August 2014 - 21
IBM Systems Magazine, Mainframe - July/August 2014 - 22
IBM Systems Magazine, Mainframe - July/August 2014 - 23
IBM Systems Magazine, Mainframe - July/August 2014 - Case Study: Credit Where Credit's Due: Isracard Group devises a novel way to verify its system integrity before disaster occurs
IBM Systems Magazine, Mainframe - July/August 2014 - 25
IBM Systems Magazine, Mainframe - July/August 2014 - 26
IBM Systems Magazine, Mainframe - July/August 2014 - 27
IBM Systems Magazine, Mainframe - July/August 2014 - 28
IBM Systems Magazine, Mainframe - July/August 2014 - 29
IBM Systems Magazine, Mainframe - July/August 2014 - Cover Story: A Secure Fortress: The mainframe delivers the reliability, safety and cost-effectiveness your IT shop needs
IBM Systems Magazine, Mainframe - July/August 2014 - 31
IBM Systems Magazine, Mainframe - July/August 2014 - 32
IBM Systems Magazine, Mainframe - July/August 2014 - 33
IBM Systems Magazine, Mainframe - July/August 2014 - Feature: Be Proactive in Risk Management: Protecting data is crucial as your business connects in ever-increasing ways along the access superhighway
IBM Systems Magazine, Mainframe - July/August 2014 - 35
IBM Systems Magazine, Mainframe - July/August 2014 - 36
IBM Systems Magazine, Mainframe - July/August 2014 - 37
IBM Systems Magazine, Mainframe - July/August 2014 - Feature: Being Risk-Aware: New IBM and Ponemon study examines the economics of IT risk and reputation
IBM Systems Magazine, Mainframe - July/August 2014 - 39
IBM Systems Magazine, Mainframe - July/August 2014 - 40
IBM Systems Magazine, Mainframe - July/August 2014 - 41
IBM Systems Magazine, Mainframe - July/August 2014 - 42
IBM Systems Magazine, Mainframe - July/August 2014 - 43
IBM Systems Magazine, Mainframe - July/August 2014 - Administrator: Active/Active Sites helps distribute workloads during outages
IBM Systems Magazine, Mainframe - July/August 2014 - 45
IBM Systems Magazine, Mainframe - July/August 2014 - 46
IBM Systems Magazine, Mainframe - July/August 2014 - 47
IBM Systems Magazine, Mainframe - July/August 2014 - Tech Corner: A point-in-time tool, Runtime Diagnostics can find issues in a pinch
IBM Systems Magazine, Mainframe - July/August 2014 - 49
IBM Systems Magazine, Mainframe - July/August 2014 - 50
IBM Systems Magazine, Mainframe - July/August 2014 - 51
IBM Systems Magazine, Mainframe - July/August 2014 - Solutions: Reflection 2014; CA Chorus; VFTP 3.0; Lifecycle Manager; STEPLIB-Rx; Ivory VisualConnect; Mainframe Abend Assist; Linux Enterprise Server Starter System for System z
IBM Systems Magazine, Mainframe - July/August 2014 - 53
IBM Systems Magazine, Mainframe - July/August 2014 - 54
IBM Systems Magazine, Mainframe - July/August 2014 - 55
IBM Systems Magazine, Mainframe - July/August 2014 - Stop Run: Together, IBM executives Pat Toole Jr. and Pat Toole St. bring more than half a century of dedication to the company
IBM Systems Magazine, Mainframe - July/August 2014 - Cover3
IBM Systems Magazine, Mainframe - July/August 2014 - Cover4
IBM Systems Magazine, Mainframe - July/August 2014 - Reference Point - Global Events, Education, Resources for Mainframe
IBM Systems Magazine, Mainframe - July/August 2014 - 2014 Mainframe Solutions Edition Product Index
IBM Systems Magazine, Mainframe - July/August 2014 - SE2
IBM Systems Magazine, Mainframe - July/August 2014 - SE3
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