We are currently running a vmWare 5.5 cluster of (3) Dell R720 servers, each with (2) 10GB iSCSI NICs connected to an MD3800i via a VLT domain of (2) Force10 S4820T switches using host vSwitch2. There is also a 3220i, which is accessed via (4) 1GB nics on each host, connected to a Force10 S50N switchstack using host vSwitch1.

Life is good and getting better ... so ...

We are going to retire our 3220i and replace it with a new 3820i. In the interest of preserving free ports on the Force10 VLT domain, we would like to stay with only (2) 10GB nics for iSCSI access and simply define (2) more iSCSI ports on vSwitch2 . 

Currently, vSwitch2 on each host looks like this:

iSCSI Port7 - IP Address: 192.168.150.12 active vNIC is vmNIC9

iSCSI Port8 - IP address: 192.168.151.12 active vNIC is vmNIC11

We are proposing to add (2) more iSCSI ports using the same vNICS, thus:

iSCSI Port7 - IP Address: 192.168.150.12 active vNIC  vmNIC9

iSCSI Port8 - IP address: 192.168.151.12 active vNIC  vmNIC11

iSCSI Port9 - IP Address: 192.168.152.12 active vNIC  vmNIC9

iSCSI Port10 - IP Address: 192.168.153.12 active vNIC vmNIC11

Can anyone point out where this design might have problems. I seem to recall being cautioned about running traffic bound for two different subnets over the same iSCSI ports.

Thoughts please?