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Thinking of doing 2Gb aggregated iSCSI between a VM Host and a multi controller iSCSI array. Multipath with two switches is normal for this, but I only have one switch at the moment. But the switch is very fast (Dell Powerconnect 6224). Other than the lack of redundancy, is there any issue doing this? Both arrays controllers will be on the same iSCSI segment for example.

Added 4/24: The iSCSI SAN device is an HP MSA 2014i array, and the physical hosts are HP servers running Hyper-V (not VMware).

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Be sure to install the host integration tools or the MEM plug-in if this is VMware. –  SpacemanSpiff Apr 23 '12 at 19:54

1 Answer 1

You are not likely to run into any problems with this. [controversial VLAN comment removed]

If your iSCSI array is currently functioning as DAS for your VM host, and you have no other physical devices that currently need to to your SAN, you also have the option of interconnecting the iSCSI device and the VM host directly. Gigabit Ethernet interfaces can be cross-connected with straight-through cables; there is no need to use either a switch or a crossover cable.

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Why would he need to separate VLANs to simulate multipathing? The Dell Equallogic recommended multipath setup is to use same VLAN, but obviously one address per NIC in the controller of the storage. –  3molo Apr 23 '12 at 19:28
If you connect the VM to the iSCSI LUN, you won't be able to use any features that require a datastore in VMWare. Last I checked, that was quite a list. –  Basil Apr 23 '12 at 19:35
@Basil I speak of a physical connection, not a logical connection. –  Skyhawk Apr 23 '12 at 19:38
Reason for asking Miles is because I have seen documentation for other storage products where separating each NIC of the storage node to it's own VLAN is a prerequisite. –  3molo Apr 23 '12 at 19:49
It's normal to use separate vLANs but not required. It is required to use different subnets for multipath redundancy. All targets on the same subnet are assumed to be in the same redundancy path. In this case, since there is no redundancy it doesn't matter either way. –  Chris S Apr 23 '12 at 20:02

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