Only one set of write operations to disk in continuous physical sequence (instead of a set of random writes), which is the most optimized write mode for RAID technology

Figure 23 on page 87 and Figure 24 on page 87 illustrate the LSF concept.

Log Structured File

SHIP'S LOG

49D12.26N 123D14.92W

49D14.07N 123D16.04W

49D19.69N 123D16.22W

Only the last position is valid!

Figure 23. LSF Concept 1

The main challenge of an LSF architecture is managing the free space. Because the LSF log has to be never-ending,an LSF system must always have enough free space for writing new data. Over time, old copies of data begin to fragment the log, so to reclaim free space, some type of automatic cleaning routine must be hardware implemented to defragment the log. This cleaning is often referred to as garbage or free space collection. The benefits of LSF outweigh the overhead of free space collection.

Log Structured File...

A

T

A

D

A

A

A

A

A

T

T

T

T

T

A

A

A

A

A

D

D

D

D

D

 

Figure 24. LSF Concept 2

LOG

The timed view of a volume, through an instantaneous duplication of the table representation of a volume, allows two independent views of the same physical data without any data move process. So each view can do independent updates that are separately recorded, while the common unchanged part is still shared. Figure 25 on page 88 shows an overview of snapping a volume with SnapShot.

Disk Environment Overview

87

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Image 109
IBM 5695-DF1, 5655-DB2 manual Ships LOG

5695-DF1, 5655-DB2 specifications

IBM 5655-DB2 and 5695-DF1 are significant components within the IBM software ecosystem, predominantly focusing on data management and integration solutions. These offerings cater primarily to enterprise environments that require robust database management systems and associated frameworks to maintain and manipulate data efficiently.

IBM 5655-DB2 is a well-known relational database management system (RDBMS) that excels in managing large volumes of structured data. Its architecture is designed to support high availability, scalability, and performance, crucial for businesses operating in today’s data-driven world. Some of its main features include advanced indexing capabilities, support for complex queries, and dynamic workload management. Additionally, it provides strong concurrency controls, which enable multiple users to access and manipulate data simultaneously without compromising data integrity.

One of the key characteristics of DB2 is its support for various data types, including JSON and XML, making it versatile for modern applications that generate data in diverse formats. It also features robust security mechanisms to protect sensitive data, aligning with compliance standards across industries. Integration with analytics tools further allows businesses to derive insights from their data, enhancing decision-making processes.

On the other hand, IBM 5695-DF1, also known as the InfoSphere DataStage, is a powerful data integration tool that facilitates the extraction, transformation, and loading (ETL) of data from various sources to target systems. It empowers organizations to streamline their data flows, ensuring that clean, consistent information is available for analysis and operational use. Key features of 5695-DF1 include a user-friendly graphical interface that enhances developer productivity and a rich set of connectors for numerous data sources, enabling seamless data integration.

DataStage also supports real-time data integration, allowing businesses to keep their data synchronized across multiple platforms. Its parallel processing capabilities dedicatedly optimize performance, enabling organizations to handle vast datasets efficiently. It incorporates data quality tools that help in validating and cleansing data before it is used for decision-making processes.

Both IBM 5655-DB2 and 5695-DF1 are part of a broader strategy to accommodate the evolving landscape of data management. Businesses leverage these technologies to enhance their data architectures, fostering agility and competitive advantage in their respective markets. Their integration capabilities, along with a focus on security and scalability, position them as vital assets in modern enterprise environments. Whether managing critical data within a database or ensuring seamless data flow across systems, these IBM offerings provide a comprehensive approach to handling complex data challenges.