SEPTENTRIO PolaRx5S, User Manual

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4.7. PRESERVE ON EVENT LOGG I NG (POEL)
4.7.2 Using Preserve on Event Logging in
combination with AutoDelete and Delete
Oldest
Both enabling the AutoDelete feature and setting the DiskFullAction to âĂ Ÿ Delete OldestâĂ Ź
will result in logged fi les being deleted from the receiverâĂ Ź s internal disk over time. This
may lead to complex scenarios in case Preserve On Event Logging is enabled as well.
POEL and AutoDelete
AutoDelete makes sure that fi les are deleted after a user-de fi ned number of days. When a
log fi le is fl agged to be preserved using POEL, the AutoDelete functionality does not delete
this fi le. Thus, as more events occur, the disk will continue to fi ll with preserved fi les until the
disk is full and the Disk Full Action is activated.
POEL and Delete Oldest
When the Disk Full Action is set to ’ Delete Oldest ’ as described in Section 4.5.1, the receiver
deletes old fi les from the disk when it becomes full. The fi les in unused or disabled log
sessions are fi rst to be deleted. The receiver then scans the enabled low-priority sessions.
The oldest fi le in these sessions is identi fi ed and deleted. I f no fi le could be deleted, the
receiver scans the medium-priority sessions, and fi nally it will scan the high-priority sessions.
Preserved fi les are the last to be deleted but, in case the disk fi lls with preserved fi les,
these fi les will also be subject to the Disk Full Action settings. From oldest to newest, the
preserved fi les from the low priority sessions are deleted. After that the preserved fi les from
the medium priority session will be deleted, until the disk is full of High priority, preserved
fi les. Once this is the case, the oldest preserved high priority fi les will be deleted (per day) to
free up space for all other log sessions.
Files of the active day and the day before the active day are not deleted. This is done to make
sure that the user can preserve a su
ffi cient amount of data before an event.
When multiple events occur within one minute, these are all considered to be the same event
by the POEL feature.
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