man > rrdresize(1)

RRDRESIZE(1)                                   rrdtool                                  RRDRESIZE(1)

NAME
       rrdresize - alters the size of an RRA and creates a new .rrd file

SYNOPSIS
       rrdtool resize filename rra-num  GROW|SHRINK rows

DESCRIPTION
       The resize function is used to modify the number of rows in an RRA.

       filename
               the name of the RRD you want to alter.

       rra-num the RRA you want to alter. You can find the number using rrdtool info.

       GROW    used  if you want to add extra rows to an RRA. The extra rows will be inserted as the
               rows that are oldest.

       SHRINK  used if you want to remove rows from an RRA. The rows that will be  removed  are  the
               oldest rows.

       rows    the number of rows you want to add or remove.

NOTES
       The  new  .rrd file, with the modified RRAs, is written to the file resize.rrd in the current
       directory.  The original .rrd file is not modified.

       It is possible to abuse this tool and get strange results by first  removing  some  rows  and
       then  reinserting the same amount (effectively clearing them to be Unknown). You may thus end
       up with unknown data in one RRA while at the same timestamp this data is available in another
       RRA.

AUTHOR
       Alex van den Bogaerdt <alex AT vandenbogaerdt.nl>

1.7.2                                        2024-03-31                                 RRDRESIZE(1)