_R_R_D_T_U_N_E(1)                          rrdtool                         _R_R_D_T_U_N_E(1)

NNAAMMEE
       rrdtune - Modify some basic properties of a Round Robin Database

SSYYNNOOPPSSIISS
       rrrrddttooooll ttuunnee _f_i_l_e_n_a_m_e [----hheeaarrttbbeeaatt|--hh _d_s_-_n_a_m_e:_h_e_a_r_t_b_e_a_t]
       [----mmiinniimmuumm|--ii _d_s_-_n_a_m_e:_m_i_n] [----mmaaxxiimmuumm|--aa _d_s_-_n_a_m_e:_m_a_x]
       [----ddaattaa--ssoouurrccee--ttyyppee|--dd _d_s_-_n_a_m_e:_D_S_T] [----ddaattaa--ssoouurrccee--rreennaammee|--rr _o_l_d_-
       _n_a_m_e:_n_e_w_-_n_a_m_e] [----ddeellttaappooss|--pp _s_c_a_l_e_-_v_a_l_u_e] [----ddeellttaanneegg|--nn _s_c_a_l_e_-_v_a_l_u_e]
       [----ffaaiilluurree--tthhrreesshhoolldd|--ff _f_a_i_l_u_r_e_-_t_h_r_e_s_h_o_l_d] [----wwiinnddooww--lleennggtthh|--ww _w_i_n_d_o_w_-
       _l_e_n_g_t_h] [----aallpphhaa|--xx _a_d_a_p_t_i_o_n_-_p_a_r_a_m_e_t_e_r] [----bbeettaa|--yy _a_d_a_p_t_i_o_n_-_p_a_r_a_m_e_t_e_r]
       [----ggaammmmaa|--zz _a_d_a_p_t_i_o_n_-_p_a_r_a_m_e_t_e_r] [----ggaammmmaa--ddeevviiaattiioonn|--vv _a_d_a_p_t_i_o_n_-
       _p_a_r_a_m_e_t_e_r] [----ssmmooootthhiinngg--wwiinnddooww|--ss _f_r_a_c_t_i_o_n_-_o_f_-_s_e_a_s_o_n]
       [----ssmmooootthhiinngg--wwiinnddooww--ddeevviiaattiioonn|--SS _f_r_a_c_t_i_o_n_-_o_f_-_s_e_a_s_o_n]
       [----aabbeerrrraanntt--rreesseett|--bb _d_s_-_n_a_m_e] [----sstteepp|--tt _n_e_w_s_t_e_p] [----ddaaeemmoonn|--DD _a_d_d_r_e_s_s]
       [DDEELL::_d_s_-_n_a_m_e] [DDSS::_d_s_-_s_p_e_c] [DDEELLRRRRAA::_i_n_d_e_x] [RRRRAA::_r_r_a_-_s_p_e_c]
       [RRRRAA##_i_n_d_e_x:[+-=]<number]>

DDEESSCCRRIIPPTTIIOONN
       The tune option allows you to alter some of the basic configuration
       values stored in the header area of a Round Robin Database (RRRRDD).

       One application of the ttuunnee function is to relax the validation rules
       on an RRRRDD. This allows you to fill a new RRRRDD with data available in
       larger intervals than what you would normally want to permit. Be very
       careful with tune operations for COMPUTE data sources.  Setting the
       _m_i_n, _m_a_x, and  _h_e_a_r_t_b_e_a_t for a COMPUTE data source without changing the
       data source type to a non-COMPUTE DDSSTT WILL corrupt the data source
       header in the RRRRDD.

       A second application of the ttuunnee function is to set or alter parameters
       used by the specialized function RRRRAAss for aberrant behavior detection.

       Still another application is to add or remove data sources (DS) or add
       / remove or alter some aspects of round-robin archives (RRA). These
       operations are not really done in-place, but rather generate a new RRD
       file internally and move it over the original file. Data is kept intact
       during these operations.  For even more in-depth modifications you may
       review the ----ssoouurrccee and ----tteemmppllaattee options of the ccrreeaattee function which
       allow you to combine multiple RRD files into a new one and which is
       even more clever in what data it is able to keep or "regenerate".

       _f_i_l_e_n_a_m_e
               The name of the RRRRDD you want to tune.

       ----hheeaarrttbbeeaatt|--hh _d_s_-_n_a_m_e:_h_e_a_r_t_b_e_a_t
               modify  the  _h_e_a_r_t_b_e_a_t  of  a data source. By setting this to a
               high value the RRD will accept things like one value per day.

       ----mmiinniimmuumm|--ii _d_s_-_n_a_m_e:_m_i_n
               alter the minimum value  acceptable  as  input  from  the  data
               source.  Setting _m_i_n to 'U' will disable this limit.

       ----mmaaxxiimmuumm|--aa _d_s_-_n_a_m_e:_m_a_x
               alter  the  maximum  value  acceptable  as  input from the data
               source.  Setting _m_a_x to 'U' will disable this limit.

       ----ddaattaa--ssoouurrccee--ttyyppee|--dd _d_s_-_n_a_m_e:_D_S_T
               alter the type DDSSTT of a data source.

       ----ddaattaa--ssoouurrccee--rreennaammee|--rr _o_l_d_-_n_a_m_e:_n_e_w_-_n_a_m_e
               rename a data source.

       ----ddeellttaappooss|--pp _s_c_a_l_e_-_v_a_l_u_e
               Alter the deviation scaling factor for the upper bound  of  the
               confidence band used internally to calculate violations for the
               FAILURES  RRRRAA. The default value is 2. Note that this parameter
               is not related to graphing  confidence  bounds  which  must  be
               specified   as  a  CDEF  argument  to  generate  a  graph  with
               confidence bounds. The graph scale factor  need  not  to  agree
               with the value used internally by the FAILURES RRRRAA.

       ----ddeellttaanneegg|--nn _s_c_a_l_e_-_v_a_l_u_e
               Alter  the  deviation scaling factor for the lower bound of the
               confidence band used internally to calculate violations for the
               FAILURES RRRRAA. The default value is 2. As with ----ddeellttaappooss,  this
               argument  is unrelated to the scale factor chosen when graphing
               confidence bounds.

       ----ffaaiilluurree--tthhrreesshhoolldd|--ff _f_a_i_l_u_r_e_-_t_h_r_e_s_h_o_l_d
               Alter the number of confidence bound violations that constitute
               a failure for purposes of the FAILURES RRRRAA.  This  must  be  an
               integer less than or equal to the window length of the FAILURES
               RRRRAA.  This  restriction  is not verified by the tune option, so
               one   can    reset    failure-threshold    and    window-length
               simultaneously.  Setting  this  option  will reset the count of
               violations to 0.

       ----wwiinnddooww--lleennggtthh|--ww _w_i_n_d_o_w_-_l_e_n_g_t_h
               Alter the number of time points  in  the  temporal  window  for
               determining  failures.  This must be an integer greater than or
               equal to the window length of the FAILURES RRRRAA and less than or
               equal to 28. Setting  this  option  will  reset  the  count  of
               violations to 0.

       ----aallpphhaa|--xx _a_d_a_p_t_i_o_n_-_p_a_r_a_m_e_t_e_r
               Alter  the  intercept adaptation parameter for the Holt-Winters
               forecasting algorithm. This parameter must be between 0 and 1.

       ----bbeettaa|--yy _a_d_a_p_t_i_o_n_-_p_a_r_a_m_e_t_e_r
               Alter the  slope  adaptation  parameter  for  the  Holt-Winters
               forecasting algorithm. This parameter must be between 0 and 1.

       ----ggaammmmaa|--zz _a_d_a_p_t_i_o_n_-_p_a_r_a_m_e_t_e_r
               Alter  the  seasonal  coefficient  adaptation parameter for the
               SEASONAL RRRRAA. This parameter must be between 0 and 1.

       ----ggaammmmaa--ddeevviiaattiioonn|--vv _a_d_a_p_t_i_o_n_-_p_a_r_a_m_e_t_e_r
               Alter the  seasonal  deviation  adaptation  parameter  for  the
               DEVSEASONAL RRRRAA. This parameter must be between 0 and 1.

       ----ssmmooootthhiinngg--wwiinnddooww|--ss _f_r_a_c_t_i_o_n_-_o_f_-_s_e_a_s_o_n
               Alter  the  size  of the smoothing window for the SEASONAL RRRRAA.
               This must be between 0 and 1.

       ----ssmmooootthhiinngg--wwiinnddooww--ddeevviiaattiioonn|--SS _f_r_a_c_t_i_o_n_-_o_f_-_s_e_a_s_o_n
               Alter the size of the smoothing window for the DEVSEASONAL RRRRAA.
               This must be between 0 and 1.

       ----aabbeerrrraanntt--rreesseett|--bb _d_s_-_n_a_m_e
               This option causes the aberrant behavior detection algorithm to
               reset for the specified data source; that is, forget all it  is
               has   learnt  so  far.   Specifically,  for  the  HWPREDICT  or
               MHWPREDICT RRRRAA, it sets the intercept and slope coefficients to
               unknown.  For  the  SEASONAL  RRRRAA,   it   sets   all   seasonal
               coefficients  to  unknown. For the DEVSEASONAL RRRRAA, it sets all
               seasonal deviation coefficients to unknown.  For  the  FAILURES
               RRRRAA,  it erases the violation history. Note that reset does not
               erase  past  predictions  (the  values  of  the  HWPREDICT   or
               MHWPREDICT  RRRRAA),  predicted  deviations  (the  values  of  the
               DEVPREDICT RRRRAA), or failure history (the values of the FAILURES
               RRRRAA).  This option will function even if  not  all  the  listed
               RRRRAAss are present.

               Due  to the implementation of this option, there is an indirect
               impact on other data sources in the RRD. A smoothing  algorithm
               is  applied  to  SEASONAL  and DEVSEASONAL values on a periodic
               basis.  During  bootstrap  initialization  this  smoothing   is
               deferred.  For  efficiency,  the implementation of smoothing is
               not data source specific. This means that utilizing  reset  for
               one  data source will delay running the smoothing algorithm for
               all data sources in the file. This is unlikely to have  serious
               consequences, unless the data being collected for the non-reset
               data  sources is unusually volatile during the reinitialization
               period of the reset data source.

               Use of this tuning option is advised when the behavior  of  the
               data  source  time  series  changes  in a drastic and permanent
               manner.

       ----sstteepp|--tt _n_e_w_s_t_e_p
               Changes the step size of the RRD to newstep.

               TODO: add proper documentation

       ----ddaaeemmoonn|--DD _a_d_d_r_e_s_s
               NNOOTTEE: Because the --dd (small  letter  'd')  option  was  already
               taken,  this  function  (unlike  most  other)  uses the capital
               letter 'D' for the one-letter option to name the cache daemon.

               If given, RRRRDDttooooll will try to connect  to  the  caching  daemon
               rrdcached  at _a_d_d_r_e_s_s and will fail if the connection cannot be
               established. If the connection is successfully established  the
               data  for  the  _f_i_l_e_n_a_m_e  will be flushed before performing the
               copy/modify  operation.  Afterwards  the   _f_i_l_e_n_a_m_e   will   be
               forgotten  by  the  cache daemon, so that the next access using
               the caching daemon will read the proper structure.

               This sequence of operations is designed to achieve a consistent
               overall result with respect to RRD  internal  file  consistency
               when  using  one of the DDSS or RRRRAA changing operations (that is:
               the  resulting  file  should  always  be  a  valid  RRD   file,
               regardless  of  concurrent updates through the caching daemon).
               Regarding  data  consistency  such  guarantees  are  not  made:
               Without  external  synchronization  concurrent  updates  may be
               lost.

               For a list of accepted  formats,  see  the  --ll  option  in  the
               rrdcached manual.

       DDEELL::_d_s_-_n_a_m_e
               Every  data  source  named  with  a  DEL  specification will be
               removed.  The resulting RRD will miss both the  definition  and
               the  data for that data source. Multiple DEL specifications are
               permitted.

       DDSS::_d_s_-_s_p_e_c
               For every such data source definition (for the exact syntax see
               the ccrreeaattee command), a new data source will  be  added  to  the
               RRD. Multiple DS specifications are permitted.

       DDEELLRRRRAA::_i_n_d_e_x
               Removes the RRA with index _i_n_d_e_x. The index is zero-based, that
               is the very first RRA has index 0.

       RRRRAA::_r_r_a_-_s_p_e_c
               For every such archive definition (for the exact syntax see the
               ccrreeaattee  command),  a  new  RRA will be added to the output RRD.
               Multiple RRA specifications are permitted.

       RRRRAA##_i_n_d_e_x:[+-=]<number>
               Adds/removes or sets the given number of rows for the RRA  with
               index  <index>. The index is zero-based, that is the very first
               RRA has index 0.

EEXXAAMMPPLLEE 11
       "rrdtool tune data.rrd -h in:100000 -h out:100000 -h through:100000"

       Set the minimum required heartbeat for data  sources  'in',  'out'  and
       'through'  to  100'000  seconds  which  is  a  little  over  one day in
       data.rrd.  This would allow to feed old data from MRTG-2.0  right  into
       RRDtool without generating *UNKNOWN* entries.

EEXXAAMMPPLLEE 22
       "rrdtool tune monitor.rrd --window-length 5 --failure-threshold 3"

       If the FAILURES RRRRAA is implicitly created, the default window-length is
       9  and  the  default failure-threshold is 7. This command now defines a
       failure as 3 or more violations in a temporal window of 5 time points.

EEXXAAMMPPLLEE 33
       "rrdtool tune some.rrd DEL:a RRA#0:+10"

       Delete the data source named aa and extend the very first archive by  10
       rows.   This  will in fact replace the input RRD with a new RRD keeping
       all existing data.  For most practical use cases this is identical to a
       real in-place modification.

AAUUTTHHOORRSS
       Tobias Oetiker <tobi@oetiker.ch>, Peter Stamfest <peter@stamfest.at>

1.10.3                            2026-05-25                        _R_R_D_T_U_N_E(1)
