08-25-2010
Quote:
Originally Posted by
rjhjr64
I used the "cat /dev/null > filename", and also tryed vi'ing the file and deleting contents with ":g/.*/d". Both seemed to work, inasmuch as deleting the contents; just won't get it back to a zero-size file (in the log's "live" environment). Thanks
Corona688 is right here. You will need to force the process to close and reopen the file.
When you redirect output onto the existing file (>logfile or cat /dev/null >logfile) you are causing the file to be unlinked from the filesystem, but if any processes still have an open file descriptor to the file, the disk space is not released and the process will continue to see the file that it has been using all along. This is why you see an empty file in the file system (reported by ls) but the space is still used (reported by du/df) and the application still has issues.
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LEARN ABOUT DEBIAN
fstrace_clear
FSTRACE_CLEAR(8) AFS Command Reference FSTRACE_CLEAR(8)
NAME
fstrace_clear - Clears the trace log
SYNOPSIS
fstrace clear [-set <set name>+]
[-log <log name>+]
[-help]
fstrace c [-s <set name>+]
[-l <log name>+] [-h]
DESCRIPTION
The fstrace clear command erases the contents of the trace log from kernel memory, but leaves kernel memory allocated for the log.
OPTIONS
-set <set name>+
Names the event set for which to clear the associated trace log. The only acceptable value is "cm" (for which the associated trace log
is "cmfx"). Provide either this argument or the -log argument, or omit both to clear the "cmfx" log by default.
-log <log name>+
Names the trace log to clear. The only acceptable value is "cmfx". Provide either this argument or the -set argument, or omit both to
clear the "cmfx" log by default.
-help
Prints the online help for this command. All other valid options are ignored.
EXAMPLES
The following command clears the "cmfx" trace log on the local machine:
# fstrace clear
PRIVILEGE REQUIRED
The issuer must be logged in as the local superuser "root".
SEE ALSO
fstrace(8), fstrace_lslog(8), fstrace_lsset(8)
COPYRIGHT
IBM Corporation 2000. <http://www.ibm.com/> All Rights Reserved.
This documentation is covered by the IBM Public License Version 1.0. It was converted from HTML to POD by software written by Chas
Williams and Russ Allbery, based on work by Alf Wachsmann and Elizabeth Cassell.
OpenAFS 2012-03-26 FSTRACE_CLEAR(8)