SnapMirror

SnapMirror

Snapmirror:

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