LUN with multiple IP addresses

I have two questions actually. The first one being: I have a machine running OpenFiler with 3 iSCSI targets. This machine has two network cards with its own IP address. There are two ESX hosts. Currently in each, I added a new datastore VMFS among those LUNS and then added two more as extensions to this VMFS datastore. This is reflected on the hosts and all using only one of the IP addresses of the exploitation of SAN and openfiler Vmotion between two hosts. Could I take a host and add the LUNS through the second IP address and ESX still not see it as a shared storage for as each host could access the same LUN via treated separate IP and have still Vmotion works through them? If so, exactly how this would and would there be predictable performance/stability problems?

Second, what sort of questions would be that we are facing if I place a second physical machine running OpenFiler and added the LUNS on this second box as extensions to the same data store? Theoretically, this should create the massive data store over two physical and accessible machines as a store of data shared by both ESX hosts. Thoughts?

NOTE: I know that we can paste the two network cards in the SAN, but we had a lot of performance/stability problems when we had the machine running a linux distro standard with servile NIC and an NFS share as the data store. I also came across reliabillity issues when you try to bond in OpenFiler where I could access the web interface and then it would become randomly inaccessible and then later come back online and back. Whatever it is, we are witnessing a DRASTIC increase in performance on this unique nic with openfiler LUN iSCSI on any other scenario, we had Setup.

In fact, Yes. Make sure that IP addresses are on different subnets for interfaces A and B:

ESX-VMK1 192.168.100.5 = talk to SAN-NIC1 = 192.168.100.254
ESX-VMK2 = 192.168.200.5 talk to SAN-NIC2 = 192.168.200.254

Under NO circumstances should you use the same subnet for the multiple interfaces...

If you have TWO ESX hosts, you can cross-available network cards so HostA 'prefer' subnet-1 and host b "prefer" subnet-2:

ESX-A-VMK1 = 192.168.100.5 talk to SAN-NIC1 = 192.168.100.254 (preferably manually in the LUN path)
ESX-B-VMK1 = 192.168.100.6 talk to SAN-NIC1 = 192.168.100.254

and

ESX-A-VMK2 = 192.168.200.5 talk to SAN-NIC2 = 192.168.200.254
ESX-B-VMK2 = 192.168.200.6 talk to SAN-NIC2 = 192.168.200.254 (preferably manually in the LUN path)

This arrangement gives you the bandwidth "dedicated" without losing the redundancy in case a card NETWORK goes down on one of the three hosts... If the subnet 1 becomes unusable (i.e. your D-Link switch dies) then a failover to the other switch will happen auto-magiquement.)

If you find my comments useful, please assign points. Thank you.

-Collin C. MacMillan

SOLORI - Oriented Solution, LLC

http://blog.Solori.NET

Tags: VMware

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