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ESXi HA Agent Unreachable

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My vCenter reported that few of the ESXi HA Agent are unreachable. I've tried to run "Reconfigure for vSphere HA" but still not working. So, step 1, put the host into Maintenance mode first. Step 2, SSH into the host, run below command to confirm whether we have HA FDM agent already installed. esxcli software vib list | grep fdm ok that confirmed we have the agent installed however , the version here is incorrect. My VCSA is version 7, and to confirm VCSA agent version, SSH to VCSA and check in the directory "/etc/vmware-vpx/docRoot/vSphere-HA-depot/vib20/vmware-fdm" to confirm the version true enough, the FDM version between ESXi and vCenter was mismatched. That means, we need to remove the FDM agent from the ESXi and try to reinitialize the HA from vCenter.  To remove the agent, you may follow KB:  How to run vSphere HA agent remove script in ESXi (83174) (vmware.com) Then I received error, that other VIB are depending on the vmware-fdm VIB in this case is Mel
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VCSA Upgrade: Stage 2 upgrade data export location

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 While upgrading VCSA from v6.7 to v7, I was greeted with  The default partition '/' has only 3.8 GB of available space. Enter a new export directory on the source machine below.   To remediate, SSH to old VCSA, enter command df -h and observe the list of partition we have in VCSA. Choose any partition that has adequate free space and copy the part under column "Mounted on". In this case, I chose the last partition.    
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