Apr 21, 2021Compression is a data reduction technology which aims to store a data set using less physical space. In Data Domain systems (DDOS), we do dedupe
Local compression further compresses the unique data segments with certain compression algorithm(s), such as lz, gzfast, gz, etc. The overall user data compression in DDOS is the joint effort of dedupe and local compression. DDOS uses "compression ratio" to measure the effectiveness of its data compression.
String used for identify objects on Apple subsystems
A Uniform Type Identifier (UTI) is a text string used on software provided by Apple Inc. to uniquely identify a given class or type of item.
Apple provides built-in UTIs to identify common system objects – document or image file types, folders and application bundles, streaming data, clipping data, movie data – and allows third party developers to add their own UTIs for application-specific or proprietary uses.
Support for UTIs was added in the Mac OS X 10.4 operating system, integrated into the Spotlight desktop search technology, which uses UTIs to categorize documents.
One of the primary design goals of UTIs was to eliminate the ambiguities and problems associated with inferring a file's content from its MIME type, filename extension, or type or creator code.