It might happen that after restart of the ESX it’s not possible to connect it back to vCenter or connect directly with vSphere client it’s not possible. Problem usually disappears after 15 minutes or so. vSphere client gives an error: The server could not interpret the communication from the client ( The remote server returned an error : (503) Server Unavailable) Restart management services doesn’t help ( service...

I noticed that even there is a quite a lot of documentation about esxtop or resxtop many users still have a problems with running esxtop in batch mode or with customize performance metrics. So I thought it would be good idea to blog out, step by step tutorial. You can run esxtop on ESX directly, so no problem with that but if you would like to run resxtop against ESXi you have to use vMA (vSphere Management Assistance), it’s a...

Top10 post for past two weeks VMware cluster HA configuration issue vSphere 5 licence comparison table esxcfg commands and logs Missing historical performance data in vCenter VirtualBOX 4.1 released with GUI clone option Platespin Migrate 8 – Troubleshooting Platespin Migrate 8 – ports used Setup Jumbo Frames on vSphere 5...

In case you still have ESX 4.0 in your enterprise and update to U3 failed with following error: DependencyError: Requested VIB rpm_vmware-esx-vmkernel64 conflicts with the host and in /var/log/vmware/esxupdate.log can be found below error message: ERROR:  esxupdate: An esxupdate error exception was caught: Traceback (most recent call last):   File "/usr/sbin/esxupdate", line 242, in ?     cmd.Run()   File...

In pre vSphere 5 if you would like to enable Jumbo Frames (MTU 9000) on your ESX/ESXi host you had to tun command: esxcfg-vswitch -m In vSphere 5 you can do it from GUI (vSphere client), Right clicking on Properties of your vSwitch in General tab at bottom you can change MTU setting. MTU size for Jumbo Frames is 9000 and remember – whole network stack has to support Jumbo Frames beginning from ESX(i) server –> network...