ILM (Information Lifecycle Management) is an approach to managing information throughout its entire lifecycle, from the creation or acquisition of data to its archiving and eventual deletion. ILM determines where data should be stored, how long it needs to be retained, what level of availability and protection it requires, and when it can be moved to a lower-cost storage tier or deleted.
ILM is used in enterprise storage systems, data centers, cloud infrastructure, backup systems, and archives. The primary goal of this approach is to manage data according to its business value, performance requirements, storage costs, and regulatory obligations.
How ILM Works
The value and relevance of information typically change over time. For example, newly created data may be actively used by applications and employees and therefore require fast, high-performance storage. After several months, the data may be accessed less frequently, while the organization may still need to retain it.
With ILM, appropriate rules are defined for different stages of the information lifecycle. A simplified process may look like this:
- New and frequently used data is stored on high-performance storage.
- Less frequently accessed data is moved automatically or manually to a more cost-effective storage tier.
- Information that must be retained for an extended period for legal or business reasons is moved to an archive.
- Once the defined retention period expires, the data is deleted in accordance with the organization’s policies.
The specific stages and retention periods depend on the type of information and the organization’s requirements.
ILM Policies
Information Lifecycle Management is based on policies that define how different categories of data should be handled.
These policies may take into account the age of the information, access frequency, data type, application requirements, level of confidentiality, regulatory retention periods, and other parameters.
For example, active project data may be stored on a high-performance storage system for one year and then automatically moved to an archive. Financial documents may have a different retention period determined by internal policies or legal requirements.
Policies make it possible to automate many of these operations and reduce the need to manually manage constantly growing volumes of information.
ILM and Storage Tiers
ILM is closely associated with the use of different storage tiers. These tiers differ in performance, cost, availability, and purpose.
Frequently accessed data can be stored on fast SSD or NVMe storage. Less active information can be moved to more cost-effective storage systems. Archival data that is rarely accessed can be transferred to object storage or specialized archival storage.
This approach avoids using expensive high-performance storage capacity for information that is rarely accessed.
However, ILM is much broader than simply moving files between storage tiers. It covers policies for storing, protecting, accessing, archiving, and deleting information throughout its entire lifecycle.
ILM, Backup, and Archiving
ILM should not be confused with backup. Backup is primarily intended to restore data after loss, corruption, or another type of failure. A backup is typically an additional copy of existing data.
Archiving serves a different purpose: it provides long-term storage for information that is no longer regularly used but still needs to remain available.
ILM incorporates these processes into a broader information management strategy. A lifecycle policy can define data backup requirements, when information should be moved to an archive, and when it should ultimately be deleted.
Why ILM Is Used
As data volumes grow, storing all information on the highest-performance systems becomes economically inefficient. ILM helps allocate storage resources according to the actual value and usage patterns of the data.
At the same time, this approach helps organizations comply with information retention requirements. Certain documents may need to be retained for several years, while other information may need to be deleted within a specified period.
ILM is therefore used not only as a way to optimize storage infrastructure but also as part of corporate data governance.