Red Hat to Add Journaling

 
 
By Timothy Dyck  |  Posted 2001-08-20 Email Print this article Print
 
 
 
 
 
 
 

The first public beta of Red Hat Linux 7.2 was just posted, and the biggest change for server use will be the operating system's default use of the ext3 file system, the next version of the Linux Second Extended File System.

The first public beta of Red Hat Linux 7.2 was just posted, and the biggest change for server use will be the operating systems default use of the ext3 file system, the next version of the Linux Second Extended File System.

ext3 adds file journaling features to the file system, writing changes to disk in two places: Changes are immediately written to a transaction log and later written (when a checkpoint happens) to the affected data blocks themselves. This double-entry system provides a major safety improvement because changes are always stored on disk at least once.

In addition, if a crash occurs, file system recovery will be much faster. While ext2 can require many minutes to check a file system for errors, in my tests, ext3 recovered each file system in just 1 to 2 seconds after I reset a server without a proper shutdown.

 
 
 
 
Timothy Dyck is a Senior Analyst with eWEEK Labs. He has been testing and reviewing application server, database and middleware products and technologies for eWEEK since 1996. Prior to joining eWEEK, he worked at the LAN and WAN network operations center for a large telecommunications firm, in operating systems and development tools technical marketing for a large software company and in the IT department at a government agency. He has an honors bachelors degree of mathematics in computer science from the University of Waterloo in Waterloo, Ontario, Canada, and a masters of arts degree in journalism from the University of Western Ontario in London, Ontario, Canada.
 
 
 
 
 
 
 

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