6 ILM Library: Techniques with Tivoli Storage and IBM TotalStorage Products
򐂰 Longer time required to backup data, but the window keeps shrinking.
򐂰 Storage performance does not meet requirements.
򐂰 Low utilization of existing assets; for example, in open environments, storage utilization
rates of around 30 percent are quite typical.
򐂰 Manual processes causing potential business risk due to errors.
򐂰 Regulatory requirements dictate long-term retention for certain data.
򐂰 Inability to achieve backup/recovery/accessibility objectives for critical data.
򐂰 Inability to grow the support staff to keep up with the demand for storage management in
an increasingly complex environment.
򐂰 Multiple backup and restore approaches and processes.
򐂰 Storage management requirements not well defined.
In response to these, it is necessary to define specific objectives to support and improve
information management:
򐂰 Control demand for storage and create policies for allocation.
򐂰 Reduce hardware, software. and storage personnel costs.
򐂰 Improve personnel efficiency, optimizing system and productivity.
򐂰 Define and enforce policies to manage the lifecycle of data.
򐂰 Define and implement the appropriate storage strategy to address current and future
business requirements.
In the next section, we describe the major ILM solution components and how they can help
you to overcome these challenges, and propose an ILM assessment for planning and design.
1.3 ILM elements
To manage the data lifecycle and make your business ready for on demand, there are four
main elements that can address your business to an ILM structured environment, as shown in
Figure 1-3 on page 7. They are:
򐂰 Tiered storage management
򐂰 Long-term data retention
򐂰 Data lifecycle management
򐂰 Policy-based archive management
Chapter 1. Introduction to ILM 7
Figure 1-3 ILM elements
In the next four sections we describe each of these elements in detail:
򐂰 1.3.1, “Tiered storage management” on page 7
򐂰 1.3.2, “Long-term data retention” on page 9
򐂰 1.3.3, “Data lifecycle management” on page 12
򐂰 1.3.4, “Policy-based archive management” on page 14
1.3.1 Tiered storage management
Most organizations today seek a storage solution that can help them manage data more
efficiently. They want to reduce the costs of storing large and growing amounts of data and
files and maintain business continuity. Through tiered storage, you can reduce overall
disk-storage costs, by providing benefits like:
򐂰 Reducing overall disk-storage costs by allocating the most recent and most critical
business data to higher performance disk storage, while moving older and less critical
business data to lower cost disk storage.
򐂰 Speeding business processes by providing high-performance access to most recent and
most frequently accessed data.
򐂰 Reducing administrative tasks and human errors. Older data can be moved to lower cost
disk storage automatically and transparently.
Typical storage environment
Storage environments typically have multiple tiers of data value, such as application data that
is needed daily and archive data that is accessed infrequently. But typical storage
configurations offer only a single tier of storage, as in Figure 1-4 on page 8, which limits the
ability to optimize cost and performance.
“The process of managing information,
from creation to disposal,
in a manner that aligns costs
with the changing value of information”
Tiered Storage
Incorporates tiered storage and
advanced SAN technologies.
Storage ranging from enterprise disk, midrange
disk and tape to optimize costs and availability
Long-Term Data Retention
Address needs for risk and
compliance objectives;
leverages Content Management and
Records Management technologies
Data Life Cycle Management
Exploit Hierarchical Storage Management for
any data that needs to be protected and
retained for a period of time and then disposed.
Establish policies and automation to move data
among different storage systems
Policy-based Archive Management
E-mail, database and application archive.
Focused offerings driven by efficiency of major
8 ILM Library: Techniques with Tivoli Storage and IBM TotalStorage Products
Figure 1-4 Traditional non-tiered storage environment
Multi-tiered storage environment
A tiered storage environment is the infrastructure needed to align storage cost with the
changing value of information. The tiers will be related to data value. The most critical data is
allocated to higher performance disk storage, while less critical business data is allocated to
lower cost disk storage.
Each storage tier will provide different performance metrics and disaster recovery
capabilities. Creating classes and storage device groups is an important step to configure a
tiered storage ILM environment. We will provide details of this in later chapters of this book.
Figure 1-5 on page 9 shows a multi-tiered storage environment.

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