Thursday, 10 November 2011



  1. Snapmirror is a license product in Netapp.
  2. SnapMirror is for Disaster recovery and its Loss of region.
  3. – Disaster Recovery
    – Data migration
    – Data replication
    – Remote access and load sharing
  4. Using snapmirror data transfer one filer to another filer or in same filer.
  5. Snapmirror will work at Volume and Qtree level.
  6. Snapmirrror needs a source and destination filer.
  7. Snapmirror is used primarily for data redundancy
  8. Real time replication of data
  9. Maximum distance of up to 35km
  10. Fibre Channel or DWDM protocol
In snapmirror 3 mode of data replication

Sync                = data transfer continually  
Async              = data transfer in scheduled timing
Semi-sync       =  like Async

Requirements and Limitations for VSM

  1. Destination’s Data ONTAP® version must be equal to or more recent than the source
  2. Like-to-like transfers only: flex-to-flex
  3. Destination volume capacity should be equal or greater than source
  4. Quota cannot be enabled on destination volume
  5. TCP port range 10565–10569 must be open

Qtree SnapMirror (QSM)

  1. Logical replication
  2. Independent of the type of volume
  3. Source volume and qtree are online/writable
  4. Destination volume is online/writable
  5. Destination qtree is read-only

Requirements and Limitations for QSM

  1. Supports Async mode only
  2. Destination volume must have 5% extra space
  3. Destination qtree cannot be /etc name
  4. Cannot be initialized using a tape device
  5. Does not support cascading of mirrors
  6. Deep directory structure and large number of small files may impact performance

Snapmirror primary configuration of VSM & QSM

Snapmirror Secondary configuration of VSM & QSM

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