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How Do You Create a Cascade SnapMirror Relationship in Cdot

I have three 8.3.2 cdot clusters in three locations, lets call them A, B, and C. A replicates content to both B and C. I need to set up two jobs that replicate content from A to B and then from B to C.

 

I've set up the cluster and SVM peering, but when I try to create the snapmirror reliationship from B to C in System Manager it doesn't list the volumes I need to replicate as choices. it indicates that the volumes must be read-write, which of course they aren't since they are snapmirror destination volumes in an A to B relationship.

 

I've not set up a cascade relationship before and don't see much documentation on how to actually do it. I assumed I could just set up a second relationship. Any insights on how to accomplish this?

Re: How Do You Create a Cascade SnapMirror Relationship in Cdot

 

Thomas -

 

Miror-Mirror cascade is supported in 8.3.2, but I don't think it's in System Manager.

You'd want to go to the command line.

 

You may want to review the Data Protection Guide:

I hope this response has been helpful to you.

 

At your service,

 

Eugene E. Kashpureff, Sr.
Independent NetApp Consultant http://www.linkedin.com/in/eugenekashpureff
Senior NetApp Instructor, FastLane US http://www.fastlaneus.com/
(P.S. I appreciate 'kudos' on any helpful posts.)

Re: How Do You Create a Cascade SnapMirror Relationship in Cdot

Thanks . I've read the section you referenced in the Data Protection Guide but it gives no specfic steps.

 

Anyone else?

Re: How Do You Create a Cascade SnapMirror Relationship in Cdot

To comment further, the man page for snapmirror create says:

 

"The source volume should be in the online state and a read-write (RW) type."

 

Of course this isn't true for snapmirror destinations.

 

As already noted, the "how a mirror-mirror cascade works" section in documentation describes how it's supposed to work but doesn't describe how to set it up.

Re: How Do You Create a Cascade SnapMirror Relationship in Cdot

 

Thomas -

 

Just do the 'snapmirror create' command for vol B > C.

It works - no special flags needed.

 

I just tried it on my simulator:

 

Progress
Source Destination Mirror Relationship Total Last
Path Type Path State Status Progress Healthy Updated
----------- ---- ------------ ------- -------------- --------- ------- --------
vs1:vola DP vs1:vs1_vola_mirror
Snapmirrored
Idle - true -
vs1:vs1_vola_mirror
DP vs1:volc Snapmirrored
Idle - true -
2 entries were displayed.

 


I hope this response has been helpful to you.

 

At your service,

 

Eugene E. Kashpureff, Sr.
Independent NetApp Consultant http://www.linkedin.com/in/eugenekashpureff
Senior NetApp Instructor, FastLane US http://www.fastlaneus.com/
(P.S. I appreciate 'kudos' on any helpful posts.)

 

 

 

 

 

Re: How Do You Create a Cascade SnapMirror Relationship in Cdot

Thank you! That worked. Looks like documentation was incorrect.