Skip to main content

ESXi vmnic shows 20gb or 40gb instead of 10gb On UCS


After configuring UCS Service profile, installing VMWare ESXi and configuring Nexus 1000v, i found VMWare vmnics were showing 20 gbps per nic. It was little confusing for me as each UCS Server port from blade to Fabric Interconnect should show 10 gbps. I started exploring it and found an interesting design of Cisco UCS VIC Cards 1340/1380 or UCS Port expander.

As you can see there is hardware port channel between the virtual nics, and the outward ports connected to the IO modules.

 As you can see it depends upon different type of connectivity between VIC cards and IO Modules, if you are connecting VIC 1340 without port expander then hardware port-channel see only two 10 gig interfaces connected to it and it presents 20 gig connections to each server Ethernet link, vmnic on ESXi in our case. And if a port expander is connected then the hardware port-channel sees four 10 gig interfaces connected to it so it represents as 40 gig connection for each Ethernet link down the Server. This bandwidth is provided only when UCS IO Modules of 2208xp are installed, if the IO Module 2104 is installed then the bandwidth will be reduced by half, as only four 10 gig connections are provided from 2104 IO module to each blade Server.

Popular posts from this blog

How to check Gray-log current running version

If you planning to upgrade your graylog and want to see what your graylog current version is, here is how you can check it. Go to the Graylog Web Interface Click on System/Nodes Under System/Nodes --- Click on the N odes  Scroll down to the ' System ' Here you can see the current version of your graylog server

How to import Putty Saved Connections to mRemoteNG

Just started using mRemoteNG and its being very cool to connect to different remote connection with different protocols e.g Window Remote Desktop, VNC to Linux, SSH, HTTP connection etc. from a single application. As new user I configured some remote desktop connection which was quite easy to figure out. But when I wanted to add SSH connections, it came in my mind to import all of the saved connections in the putty. But I couldn't figure it out how can it be done, though it was quite easy and here are the steps. Open your mRemoteNG Create a folder if you want segregation of multiple networks Create a new connection Enter the IP address of remote server under connection in Config pane Under the config pane, select protocol " SSH version 2 ".  Once you select protocol to SSH version 2 you are given option to import putty sessions, as shown in the snap below. In the above snap, I have imported CSR-AWS session from my saved sessions in Putty.

Connection control operation failed for disk 'ide1:0'

I was getting this error while removing Operating System ISO image mounted on the Virtual Machine. What worked for me, is 1. Uncheck the "Connected and Connect at power on" from Device Status. 2. Then Change the Device type from " Datastore ISO File to Client Device " Radio Button 3. and press OK to save the changes. Note:- I was able to remove the mounted ISO only by directly logging to the ESXi at https://esxi-ip-address/ui where it asks "The guest operating system has locked the CD-ROM door and is probably using the CD-ROM, which can prevent the guest from recognizing media changes. If possible, eject the CD-ROM from inside the guest before disconnecting. Disconnect anyway and override the lock?" You need to select yes to eject the CD-ROM and then remove the ISO file successfully.