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Migrating VM with RDM into another ESX host in different SAN array

Posted on 2012-09-02
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Last Modified: 2012-09-03
Hi All,

I'm about to do my Exchange Server 2007 DR migration from one SAN array into another new SAN array but without ISL link.

so what should I expect and I do in order to make it working in the new ESXi blades connected to the new array ?
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LVL 124
ID: 38358919
Do you want to keep using an RDM in the new SAN, or change to VMDK?
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Assisted Solution

by:mhdganji
mhdganji earned 1000 total points
ID: 38358946
Re: Options for moving Raw Device between SAN's (not just RDM)

All the options need down time for the VM:

 

Option-1:

     Cold Migration gives you a way to move all your VMs (with RDM disks) from one Storage Array to other.

     But the problem here is your RDM disks will be converted to virtual disks.

     Later you can clone this virtual disk to a RDM using vmkfstools. Then remove the vmdk and add this RDM to the VM.

 

Option- 2 :

     Remove (not delete) the RDM from the VM.

     SVMotion the VM to other Storage Array, then clone the RDM from Storage Array 1 to Storage Array 2 (using vmkfstools).

     Attach this RDM to the VM.

http://communities.vmware.com/thread/226491
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LVL 124

Accepted Solution

by:
Andrew Hancock (VMware vExpert / EE MVE^2) earned 1000 total points
ID: 38358959
Option 3

Use  VMware vCenter Converter Standalone 5.0 to create a V2V.

See my EE Articles

HOW TO:  P2V, V2V for FREE - VMware vCenter Converter Standalone 5.0

HOW TO: Improve the transfer rate of a Physical to Virtual (P2V), Virtual to Virtual Conversion (V2V) using VMware vCenter Converter Standalone 5.0

Option 3, is very safe, because it does not touch or change the original VM, so you have a Rollback plan. You end up with the same VM, on new SAN, but it's been converted to virtual disks (vmdks) on the new SAN datastore.
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Expert Comment

by:mhdganji
ID: 38358969
I Think Cold Migration and Option 3 You Suggested Last The Same
But I Agree That Your Option is Safer !
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LVL 124
ID: 38358979
No physical move with Option 3!  It's a copy/clone.

You cannot rollback, if it all goes wrong with any other option.
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LVL 8

Author Comment

by:Senior IT System Engineer
ID: 38360133
Hi,

Do you want to keep using an RDM in the new SAN, or change to VMDK?

I'd like to use 1.5 TB VMDK over VMFS, as I no longer implement Physical RDm for my Exchange Server due CCR working fine, I do not need to use EMC Replication manager to do the SnapView directory checking.
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Author Comment

by:Senior IT System Engineer
ID: 38360146
HancockA,

Using V2V with VMware converter sounds great :-)
the only issues at the moment is that between two SAN array, there is no ISL (Inter Switch Link) in place yet, so sVmotion is not an option.

Hm.. I am thinking to just "re-create" the VM C:\ drive only while the rest of the Database and Transaction log can be recreated again manually using Update-StorageGroupCopy (Exchange DB re-seed).
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LVL 124
ID: 38360159
there is no requirement for a ISL.

Do you have a workstation or server, which can connect to both Hosts (which are connected to the SAN).

V2V copies from one ESX host (connect to old SAN), to the other ESX host (connected to new SAN). Across the network.
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LVL 8

Author Comment

by:Senior IT System Engineer
ID: 38360169
Do you have a workstation or server, which can connect to both Hosts (which are connected to the SAN).
Yes it is my VCenter VM itself :-)
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LVL 124
ID: 38360188
Okay, so you will be able to complete the V2V from this computer with VMware vCenter Converter Standalone 5.0 installed.
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LVL 8

Author Closing Comment

by:Senior IT System Engineer
ID: 38360214
Many thanks for the information and solutions provided.
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LVL 8

Author Comment

by:Senior IT System Engineer
ID: 38360236
So is this the software that you mention "VMware vCenter Converter Standalone 5.0" --> Freeware ?
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LVL 124
ID: 38360244
Yes, follow my Article and Links!
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