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1118
August 14th, 2018 06:00
Multiple iSCSI interfaces on same Ethernet Interface
We currently have 2 RHEV hosts making an iSCSI connection to eth2 on our vnxe3200 (SPA assigned 10.0.X.A and SPB assigned 10.0.X.B on vlanXYZ). We now have two new ESXi hosts we would like to connect to the vnxe3200 via iSCSI but we are limited on Ethernet ports on the 3200. I know it is not best practice but can we create additional iSCSI interfaces on eth2, for instance assigning SPA 10.0.X.C and SPB 10.0.X.D on vlanXYZ ? We would essentially end up with SPA having 10.0.X.A/10.0.X.C and SPB having 10.0.X.B/10.0.X.D, all on vlan XYZ with RHEV hosts connected to X.A and X.B and ESXi hosts connected to X.B and X.D, all on eth2. Anyone know of bad things that could happen?
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kelleg
4.5K Posts
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August 29th, 2018 07:00
Not real sure about the VNXe3200, but on the VNX and Unity arrays each ethernet port can support up to 8 virtual IP addresses (I think it's higher than 8 on the Unity).
With iSCSI you want to be sure to segregate the different IP ranges - you could use subnet masking or separate VLAN. Also, be sure to use an Enterprise Class switch for iSCSI and not have other traffic.
glen
milesb1
2 Posts
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August 29th, 2018 07:00
Thanks! We were told by EMC support that it should work utilizing the multiple iSCSI interfaces/IPs on the same VLAN residing on the same physical port. So we tried it. Thankfully the VNXe was smart enough to tell us "No, you can't do that" when we tried to apply the settings. So we have done as you suggested, and more in line with best practices, and created a second VLAN for the additional iSCSI interfaces on that physical port.