Jumbo Frames on your vSphere ESXi box
Continuing on from this http://sigtar.com/2010/02/04/vsphere-and-multipathing-iscsi/
you may want to implement jumbo frames to your iSCSI backend…
Enable jumbo frames on your iSCSI target and switches then complete the following on the ESXi hosts (iSCSI initiators)…
This to list your current switch details and port group names…
esxcfg-vswitch -l
The follownig to allow jumbo frames onto your vswtich (insert your vSwich in following)
esxcfg-vswtich -m 9000 vSwitch0
Then delete and recreate your kernel port groups that you setup for iscsi, my commands looked like this… (repeat for each iscsi kernel port you have)
esxcfg-vmknic -d iSCSI-1
esxcfg-vmknic -i 10.0.0.101 -n 255.255.0.0 -m 9000 iSCSI-1
to confirm you have set the MTU (frame size) correctely, run the following….
esxcfg-vmknic -l
you should see your iSCSI kernel ports with a MTU of 9000 all going well.
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