Hello and Happy New Year to everyone.
I am in the process of building out a storage design using iSCSI from Intel / Dell X520-DA2 Ethernet Server Adapters on a Dell R730xd connected to a Cisco 5596UP switch. VCenter ESXi hosts are connected to the Nexus switch using the same Intel X520-DA2 adapters. On the Freenas, mtu 9000 is enabled on the NIC's for iSCSI and on the vmkernel adapters and virtual distributed switches in VCenter. I can only enable jumbo frames globally (mtu 9216) on the Nexus 5596UP, not under the specific interface as this is not a feature.
In VCenter, I can scan for the LUN's and the hosts sees the LUN's. The issue is when I try to add a Datastore I get a error message "The 'Create VMFS datastore' operation failed for the entity with the following error message. Cannot change the host configuration" and according to VMware, https://kb.vmware.com/s/article/2151431, I must change the interfaces mtu to 1500 or I can use 9000.
If I connect from Freenas directly to the hosts using mtu 9000 bypassing the Nexus Switch, I can add the datastores but this is not a scalable solution as I will have as many as 10 ESXi hosts.
Does anyone have a solution or a config for the Nexus?
Do I really need to set the mtu 9000 everywhere for iSCSI even when using the Intel X520-DA2 or can I get away with mtu 1500?
Thanks,
I am in the process of building out a storage design using iSCSI from Intel / Dell X520-DA2 Ethernet Server Adapters on a Dell R730xd connected to a Cisco 5596UP switch. VCenter ESXi hosts are connected to the Nexus switch using the same Intel X520-DA2 adapters. On the Freenas, mtu 9000 is enabled on the NIC's for iSCSI and on the vmkernel adapters and virtual distributed switches in VCenter. I can only enable jumbo frames globally (mtu 9216) on the Nexus 5596UP, not under the specific interface as this is not a feature.
In VCenter, I can scan for the LUN's and the hosts sees the LUN's. The issue is when I try to add a Datastore I get a error message "The 'Create VMFS datastore' operation failed for the entity with the following error message. Cannot change the host configuration" and according to VMware, https://kb.vmware.com/s/article/2151431, I must change the interfaces mtu to 1500 or I can use 9000.
If I connect from Freenas directly to the hosts using mtu 9000 bypassing the Nexus Switch, I can add the datastores but this is not a scalable solution as I will have as many as 10 ESXi hosts.
Does anyone have a solution or a config for the Nexus?
Do I really need to set the mtu 9000 everywhere for iSCSI even when using the Intel X520-DA2 or can I get away with mtu 1500?
Thanks,