title: Redis is having very high fragmentation ratio
body: <p>My Redis cluster architecture is running with high fragmentation ratio upto 60. 
  Is is good? What should be the ideal value ? What should I do get it normal?</p>
  
  <p>the fragmentation ratio decrease during the working hours to as low as 2 while during non working hours it is as high as 50-60.</p>
  
  <p>This issue is causing as we have put our log in / log out session state in redis. So there are frequent insert / delete in redis db.</p>