title: TimeShift in Graphite
body: <p>When running the function timeShift on graphite, I notice that if I change the 'from' to be large from (something also with -30days) the data is changing.
  It seems to come back from graphite as aggregation data that some of the points have combined into 1 </p>
  
  <p>Someone know what happen? And why?</p>
  
  <p><strong>Edit</strong></p>
  
  <p>this is our retentions on storage-aggregation.conf</p>
  
  <pre><code>[t]
  pattern = ^t\.
  retentions = 5min:30d,1h:180d,1d:1y
  
  
  [z]
  pattern = ^z.*
  retentions = 10s:14d,1min:30d,10min:1y
  </code></pre>
  
  <p>what should I do to fix the timeShift problem, that jump when I'm in t.* and I use from = -30days and ask for timeshift of 7days I'm getting aggregate numbers</p>