SAN transfers using iSCSI and SCVMM

Posted on 2010-04-09
Medium Priority
Last Modified: 2013-11-08
I have set up several Windows Server 2008 R2 Hyper-V hosts, as well as Microsoft SCVMM on our internal LAN.  Everything is connected to the LAN, as well as via a SAN network on dedicated NICS.  The NICs are not HBAs, just NICs.
When I want to move a VM to another host, or any VM work, the SCVMM shows that SAN transfers are possible, but it will not use the iSCSI SAN.
It appears that SCVMM does not see the iSCSI SAN using NICs as a usable path for SAN traffic.  Is that true?  Do I need a FC SAN?  Do I need iSCSI HBAs?
Thanks in advance!
Question by:AFlowers
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Expert Comment

ID: 30237834

Author Comment

ID: 30514215
Hi msmamji,

Thanks for the notes.  I read them, and forwarded one to my SAN hardware vendor to see about the VDS.

I actually have a twofold problem, the other related to this one.  Not only am I having trouble with SAN transfers, I also want the Hyper-V system to use the backend LAN instead of the public LAN.  For example, when attaching a virtual drive for a VM to use, the system transfers all that disk content through the primary LAN.  Is there a way to make the system use the backend LAN (where the SAN resides) for virtual host/manager traffic?

I can make this a separate question if you think I should.
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Accepted Solution

msmamji earned 2000 total points
ID: 30542656
Maybe the following will help.
SAN transfers or migration are available for only three scenarios
1. Moving a VM from one host to the other,
2. Moving a VM from a library to a host, and
3. Moving a VM from host to a library.

Irrespective of the case you have, the VM has to reside on the SAN storage and server needs to be properly configured to have SAN Migration available in the Admin console.

VMM also requires that each LUN contains only one VM. and each LUN should be configured as a basic disk.  This also make sense since having more than one VM on a LUN can lead to unexpected result for the other VMs. VMM requires automount to be disabled on the Hyper-V host involved in SAN migration.

NOTE: VMM does not provision or manage the SAN infrastructure. LUNs need to be created and surfaced to the host machine so that VMM server can use them.

Configuration requirement for  SAN transfers:
Following components have to be installed on the VMM servers:

iSCSI SAN migrations require each host/library that is part of the SAN to have VDS 1.1 or later installed. Windows Server 2008 comes with VDS 2.1 preinstalled and does not need any configuration. Each host should also have the latest Microsoft iSCSI Initiator installed in it. The VMM server needs to have Microsoft VDS hardware provider installed.

SAN transfer does not necessarily require copying the actual files around, and the SAN infrastructure is used to mask/unmask LUNs, depending upon the direction of the transfer.

Now, as you can see from the above, if you are looking for data transfer over the wire using SAN transfer, there is not much moving on the wire.  So there might be nothing wrong with your setup.

On the other hand, when using SAN transfers you are seeing lot of traffic on either you NICs (iSCSI or LAN) then this might be worry for you.

Hope that brings some clarity.

Regarding your other issue, I will try to add something in here later. Its well past mid-night here.

Author Comment

ID: 30543632
Thanks again!  I'll leave this open for a few days in case something else comes to mind.

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