How to migrate/Storage vMotion from one Datastore/LUN to another in different subnets

One of our Production Servers has NL 10K storage (IP: 192.168.41.x.  on HP LeftHand.
We intent to migrate  the Datastore/LUN to  a new storage array running Flash/SSD. ie move all the contents to the new SSD datastore/LUN  (IP:192.168.104.x on HP 3PAR) in a production environment .

How can this be done? Especially the network connections.  What do I have to do

Could I get a step by step instruction on how this can be done seamlessly from A-Z.
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Andrew Hancock (VMware vExpert / EE MVE^2)Connect With a Mentor VMware and Virtualization ConsultantCommented:
Okay, there is a function called Shared Nothing Migration, which can Migrate between storage and hosts, which are not connected to the same storage.

BUT vMotion networks must be able to communicate with each other.

So you've got some decisions to make, do you connect storage to both hosts or not?

Is this arrangement going to be permanent or just for this migration.?

Whatever you decide you will need to create a vMotion network so each host can communicate with each other ?

Is this possible ?

Time for migration is based on so many things, so it is difficult to give you a time, but it should not matter, because Migrations are completed in realtime, with no downtime.
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
You would migrate the virtual machines between storage devices.

The simplest method is using Storage vMotion, make sure each ESXi host is connected to both source and destination datastores, and then click right Click the VM and select Migrate, select your datastore, and be patient whilst it's moved.

Is your host currently connected to both storage devices ?
cgeorgeisaacAuthor Commented:
Currently Each Host is  in  different clusters having different  IPs (one Host  has IP: 192.168.41.x  and  Second Host has IP : 192.168.104.x) and NOT connected to Both Storage devices but connected to separate Storage devices.

Correct me if I am wrong:  As per your suggestion: First, ensure each ESXi Host is connected to the source and destination Datastore - For this will I require additional HBA cards for each Hosts in the Cluster?   Then next, do you mean I   create Datastore/LUN and Zone.  Do the subsequent scan on the storage to ensure the Datastore  is visible to the Hosts. Then ensure both Hosts are connected to both the Networks/Storage and subsequently do Storage vMotion - do I have to create an additional network?   FYI the Datastore we have will be about 5TB in SSD.   Really wanted a step by step instruction to follow or some links.  

Also, approximately how much time will it take to migrate (Storage vMotion)  1 TB.  Thanks.
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cgeorgeisaacAuthor Commented:
Do you have any links for "Shared Nothing Migration". Thanks.
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
cgeorgeisaacAuthor Commented:
I think only Storage vMotion will work in our case as I am not comfortable with "Shared Nothing Migration".   We have  3 Datastores that need to be migrated to the other storage array.  What is the best option -  To do it one by one or  Do it all at the same time? Or any other way?
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
If you are not comfortable with share nothing migration, then you will have to make sure that ALL hosts have access to both new and old datastores, to complete Storage vMotion.

You will also have to make sure that vMotion VMKernel Portgroups can communicate with each other, and test using ping and vmkping.

Present all the new datastores to ESXi hosts, and then you have to migrate each VM at a time. We would migrate one VM at a time.
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