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nfexpire(1)							   nfexpire(1)

       nfexpire	- data expiry program

       nfexpire	[options]

       nfexpire	 is  used  to manage the expiration of old netflow data	files,
       created by nfcapd(1) or other data collectors such as  sfcapd(1).  Data
       expiration is done either by nfcapd(1) in auto expiry mode, or by nfex-
       pire which can by run at	any time or any	desired	time interval by cron.
       nfexpire	 can  also  be safely run while	nfcapd auto expires files, for
       cleaning	up full	disks etc. nfexpire is sub directory hierarchy	aware,
       and handles any format automatically.  For a fast and efficient expira-
       tion, nfexpire creates and maintains a stat file	named .nfstat  in  the
       data  directory.	  Any directory	supplied with the options below	corre-
       sponds to the data directory supplied to	nfcapd(1) using	option -l.

       -l directory
	  List current data statistics in directory datadir.

       -r directory
	  Rescan the specified directory to update the statfile.  To  be  used
	  only	when  explicit update is required. Usually nfexpire takes care
	  itself about rescanning, when	needed.

       -e datadir
	  Expire files in the specified	directory.  Expire  limits  are	 taken
	  from statfile	( see -u ) or from supplied options -s -t and -w. Com-
	  mand line options overwrite stat file	values,	however	 the  statfile
	  limits are not changed.

       -s maxsize
	  Set size limit for the directory. The	specified limit	accepts	values
	  such as 100M,	100MB 1G 1.5G etc. Accpeted size factors are K,	KB, M,
	  MB, G, GB and	T, TB.	If no factor is	supplied bytes (B) is assumed.
	  A value of 0 disables	the max	size limit.

       -t maxlife_time
	  Sets the max life time for files  in	the  directory.	 The  supplied
	  maxlife_time	accepts	 values	 such  as 31d, 240H 1.5d etc. Accpeted
	  time scales are w (weeks) d (days) H (hours).	A value	of 0  disables
	  the max lifetime limit. If no	scale is given,	H (hours) are assumed.

       -u datadir
	  Updates  the max size	and lifetime limits, specified by -s -t	and -w
	  and stores them in the statfile as default  values.  A  running  nf-
	  capd(1)  process doing auto expiry will take these new values	start-
	  ing with the next expiry cycle. Running  nfexpire  next  time	 doing
	  file	expiration  will  take these new limits	unless -s -t or	-w are

       -w watermark
	  Set the water	mark in	% for expiring data. If	a limit	is hit,	 files
	  get  expired	down to	this level in %	of that	limit. If not set, the
	  default is 95%.

       -h Print	help text on stdout with all options and exit.

       -p Directories specified	by -e, -l and -r are  interpreted  as  profile
	  directories. Only NfSen will need this option.

       -Y Print	result in parseable format. Only NfSen will need this option.

	   0   No error.
	   255 Initialization failed.
	   250 Internal	error.

       There are two ways to expire files: nfcapd in auto-expire mode (	option
       -e ) and	nfexpire running by hand or periodically  as  cron  job.  Both
       ways synchronize	access to the files, therefore both ways can be	run in
       parallel	if required.

       Expiring	by nfcapd in auto-expire mode: option -e
       If nfcapd is started with option	-e, the	auto-expire mode  is  enabled.
       After  each  cycle ( typically 5min ) nfcapd expires files according to
       the limits set with nfexpire using options -u -s	-t  and	 -w.  If  ini-
       tially no limits	are set, no files get expired.

       Expiring	by nfexpire
       nfexpire	can be run at any time to expire files.	It automatically syncs
       up with the files created by nfcapd in the mean time since the last ex-
       pire  run,  if a	nfcapd collector process is running for	that directory
       in question and expires the files according the limits set.

       Files are expired according to two limits: maximum disk space  used  by
       all files in the	directory and maximum lifetime of data files, whatever
       limit is	reached	first.	If one of the limit is hit the expire  process
       will delete files down to the watermark of that limit.


				  2009-09-09			   nfexpire(1)


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