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Replicated Storage

Posted on 2014-12-02
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Last Modified: 2014-12-10
Hi,

I have a netapp storage which was initially created for Replication into our DR Site. Now We created a new Data center and new hosts are added into that DC. I want the same storage to mount on the new hosts. I checked on my Netapp Manager but no LUNS are showing with that name, only volume is created. I don't want to create a new LUN but share the same Datastore.
Any Suggestion!
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Question by:Techie solution
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21 Comments
 
LVL 118
ID: 40477357
So you have LUNs that have been Snap Mirrored into this NetApp at the DR Site?

If so, you will need to Break the Snap Mirror relationship, because the volumes will currently be Read Only.

You will then need to add the IQNs of the ESXi Hosts to the LUNs.

What was the previous setup iSCSI/FC LUNs or NFS Volumes ?

You should have LUNs displayed, are these NFS Volumes ?

You will need to setup Exports for them in NFS volumes ?
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Author Comment

by:Techie solution
ID: 40477444
I am not able to see the LUN (FC).

How to see if the LUN is Snap mirrored and how to break the relationship?
All these are new to me.

Please Suggest!
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LVL 118

Accepted Solution

by:
Andrew Hancock (VMware vExpert / EE MVE) earned 500 total points
ID: 40477468
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Author Comment

by:Techie solution
ID: 40478513
I need this storage to be the DR storage  for new host also as the initial one not the normal storage will breaking the relationship hamper my plan.
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LVL 118
ID: 40478528
Your DR ESXi hosts will not be able to access this storage UNLESS the Snapmirror Relationship is broken.

Which means Production --> DR snapmirror will stop.

You may have to look at cloning the Snapmirrored volumes to Production Volumes, on the DR Filer.
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LVL 21

Expert Comment

by:robocat
ID: 40478554
What you want is to create a new volume or volumes in the storage (aggregate).

You keep the old volumes for replication of the data from the other side.
You use the new volume for creating new LUN/datastore

What you can not do is mix both or use the same datastore for both sites. The replicated datastore is read only by definition, unless you break replication.
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Author Comment

by:Techie solution
ID: 40478587
Ok,
Then can I re-establish this relationship between all the host after adding the initiators to the LUN since I need to have the same DR configuration with the new hosts also.
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Author Comment

by:Techie solution
ID: 40479267
Hi robocat,

I don't want to create new volume or datastore. I need to share the same datastore with new datacenter created on the same DR site.

If I break the replication, will I be able to re-establish this between new hosts and host which was already holding that datastore. Please Suggest!
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LVL 118
ID: 40479287
If I break the replication, will I be able to re-establish this between new hosts and host which was already holding that datastore. Please Suggest!

No. Because re-creating the mirror, makes the volume at DR read only, and the LUN is read only.
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LVL 21

Expert Comment

by:robocat
ID: 40480614
What you want can not be done. A volume/LUN can not be both target for a mirror and be read/write at the same time.

Perhaps you should explain in detail what you're actually trying to accomplish, this makes it easier for us to make suggestions on how to get the results you're after.
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Author Comment

by:Techie solution
ID: 40480657
Ok Sure!
I have 2 cluster A and B. A has one host which was previously configured and has two Datastore one is normal netapp and other is for Replication (Snapmirrored).Cluster B was just been configured and has two host. I masked the lun which was also present in the Cluster A, now I can see that Datastore( normal netapp) on all the hosts. I want to share the Replicated Datastore in the same way I did for the other one, but  am unable to see the LUN to do LUN masking.

As per all your suggestion I can break the mirror relationship and delete the snapshots(mirrored). Then I can do the LUN masking and my datastore would be visible as the other one, but then I cannot re-configure mirroring.

Please Suggest what would be the possible way to configure DR on both cluster in common or Is there any other way I can configure it.
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LVL 118
ID: 40480692
CLONE the Snapmirror to a new VOLUME at the Destination, and use this new CLONE.
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LVL 21

Expert Comment

by:robocat
ID: 40481130
You're saying that you see the replicated datastore from your DR netapp on the host A?? That should not be possible at all??

Or are you saying that you see the datastore on the source netapp (that is mirrored to the DR netapp) on host A?  

Perhaps you should make a little diagram with source netapp, DR netapp and what you are trying to connect to what. I have a feeling that this is somehow a big misunderstanding.
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Author Comment

by:Techie solution
ID: 40481632
I am able to see the datastore (that is mirrored to the DR netapp) on the host A.
I am not able to see the LUN which is visible to Host A in Oncommand Manager. How can I Map LUN to the new ESXI?
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LVL 118
ID: 40481664
You will need to add the IQN or WWNN to the LUN, and then Re-SCAN the HBA.
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Author Comment

by:Techie solution
ID: 40481713
I know , but LUN is not visible. how will I add IQNs?
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LVL 118
ID: 40481777
The LUN is not visible, if the Volume is Read Only or Restricted.

Does this apply ?
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Author Comment

by:Techie solution
ID: 40482204
I broke the relationship and was able to map the LUN through shell, during this process the datastore which was initially configured in an old esxi is showing inactive (lost connection). Is this recommended to reboot host if required?
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LVL 118
ID: 40482220
if there was a snapmirror relation ship, the volume, is restricted/read only and must be broken, which has been stated.

Is this mapped to a different ESXi host ?

I'm not sure how a LUN which is not connected, because the volume is Read Only affects an old ESXi host datastore, and becomes inactive, I think we need screenshots here.
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Assisted Solution

by:Techie solution
Techie solution earned 0 total points
ID: 40482944
The issue is solved, Thank You!
I rebooted the host and the storage was active.
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Author Closing Comment

by:Techie solution
ID: 40490911
This issue was solved
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