vSphere 4 iSCSI

Rio_10
Rio_10 used Ask the Experts™
on
Hi all,

I need some help setting up my vSphere iSCSI connections.

Setup is as follows:

1 ESX server with 2 iSCSI Nics,
2 Physical switches
1 Storage Array with 1 controller and 2 iSCSI Nics

In ESX
 
1 iSCSI Nic - 192.160.248.3 into a vSwitch with 2 vnics of 192.160.248.1 and 192.160.248.2
1 iSCSI Nic - 192.160.249.3 into a vSwitch with 2 vnics of 192.160.249.1 and 192.160.249.2

From ESX

1 iSCSI Nic - 192.160.248.3 into 1 Physcial switch - 192.160.248.x
1 iSCSI Nic - 192.160.249.3 into 1 Physcial switch - 192.160.249.x

Then from:

1 Physcial switch - 192.160.248.x into storage array 192.160.248.4
1 Physcial switch - 192.160.249.x into storage array 192.160.249.4

The problem seems to be with Multipathing in ESX. When i setup the iSCSI initiator and use the Dynamic Discovery it finds both the 192.160.248.4 and 192.160.249.4 iSCSI ports. These get added successfully but when i check the path of the iSCSI it has 192.160.248.4 twice. One connection states Active I/O and the other active.

If i pull out the network cable the connection is lost because there is no 192.160.249.4 as one of the paths.  I really need some help on this experts, ive been racking my brain, im so close to finishing the configuration.

I want one of the paths to be 192.160.248.4 and the other 192.160.249.4 for redundency. Is this not possible you cant have two different subnets on the one initiator?

Thanks in advance.

Rio


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Paul SolovyovskySenior IT Advisor
Top Expert 2008

Commented:
Paul SolovyovskySenior IT Advisor
Top Expert 2008

Commented:
The VMKernel doesn't need to be on another subnet but you should have 2 VMkernel ports

Author

Commented:
Paulsolov, in vSphere two VMkernel ports are not needed unlike ESX 3.5.

I have played around with two ports just incase but its still the same result
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Author

Commented:
in the document is states

Note that within the Path Management, that the ESXi Hypervisor is using two paths (via two subnets) to mount the same iSCSI Target

but mine has the same ip twice, everything i have done is just like the docs
Justin CAWS Solutions Architect

Commented:
Here is one of the best articles on vSphere iSCSI MPIO I've read:

http://virtualgeek.typepad.com/virtual_geek/2009/09/a-multivendor-post-on-using-iscsi-with-vmware-vsphere.html

When you say "2 iSCSI NICs", are you refering to hardware iSCSI adapters or using 2 standard NICs with the software iSCSI adapter?
Commented:
Yep hardware iSCSI adapters, im just not sure why the MPIO has the same IP twice when in the initiator it has the two different IPs. I have added them manaual as well and its the same thing

Author

Commented:
Issue was with the iSCSI path, its was trying to connect to a switch on a different subnet!

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