Data Need - ILM

• If we could store all data on fast disks all the time - life would be sweet.
• Unfortunately, this is not economically viable - so we need to move less needed data into cheaper (and slower) storage.
• Thus a term was coined - ILM - Information Life-cycle Management.
• There are two things normally done here:
  • Manually moving data to slower storage (e.g. backup and delete from main storage).
  • Automatic tiering - storage systems move data from expensive disks to cheaper disks based on LRU information.

Originally written by guy keren