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05-01-2018 08:00 AM
05-01-2018 08:00 AM
MSA 2040 IP jumbo packet size with VMware ESXi 6.5 hosts
Hello,
I have three ESXi 6.5 hosts connected through Cisco switches to a MSA 2040 using iSCSI. Jumbo frames have been enabled in each device.
MSA 2040 - Jumbo Frames enabled
Cisco - jumbomtu 9000
ESXi - vmk's nic settings MTU 8900 (per https://www.stephenwagner.com/2016/11/05/hpe-msa-2040-jumbo-frames-and-mtu-configuration/)
When I perform a tcpdump-uw on the ESXi host the largest packet size I see is 4144. I would think I would see something in the 8000 range. A vmkping -d -s 8872 command works successfully.
Is 4144 the max tcp packet size I should expect?
Thank you,
Altoon
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05-04-2018 07:43 AM - edited 05-04-2018 07:44 AM
05-04-2018 07:43 AM - edited 05-04-2018 07:44 AM
Re: MSA 2040 IP jumbo packet size with VMware ESXi 6.5 hosts
As you said vmkping command worked successfully then there is no question of the capability of your setup to handle Jumbo frames.
Now question is exact trafiic flow and how to measure it and from that you are checking if it's hitting 8000 or not. In that case it's a question of using packet snif method.
May be better to use some third-party packet sniffer software inside one of the virtual machines on the vSwitch.
Hope this helps!
Regards
Subhajit
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