EMEN2 Maintenance and Backups
EMEN2 supports three types of backups: Log Archive, Cold Backup, and Hot Backup.
Log Archive
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EMEN2 uses Berkeley DB as the underlying database technology. To provide guarantees about transaction atomicity and durability, Berkeley DB writes changes first to a log file on stable storage before a transaction is marked as committed. Database files are not updated until this step is complete. In the event of a crash or hardware failure, the database files can be checked against the log files to correct any errors or missing data.
The log files are stored in $DB_HOME/log as log.XX, where XX is a sequential integer starting from 1. With default settings, the files are 8 MB each. As one log file is finished, the next log file in the sequence is created and used as the active log file.
Edit conflict - your version:
EMEN2 uses Berkeley DB as the underlying database technology. To provide guarantees about transaction atomicity and durability, Berkeley DB writes changes to a log file on stable storage before a transaction is marked as committed. Database files are not updated until this step is complete. In the event of a crash or hardware failure, the database files can be checked against the log files to correct any errors or missing data.
The log files are stored in $DB_HOME/log as log.XX, where XX is a sequential integer starting from 1. With default settings, the files are 8 MB each. As one log file is finished, the next log file in the sequence is created and used as the active log file.
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Log files that are not being used by any open transaction may be archived after a "Checkpoint" is made. This frees up disk space in the DB_HOME environment, and lets the administrator move the logs to long term archival storage.
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The EMEN2 backup utility will archive finished logs when run with the "--archive" flag. Finished log files will be moved to the location specified by the "ARCHIVE" configuration setting.
backup.py --archive
Edit conflict - your version:
The EMEN2 backup utility will archive finished logs when run with the "--archive" flag. Finished log files will be moved to the location specified by the "ARCHIVE" configuration setting.
backup.py --archive
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Cold Backup