What will you do after receiving Purple Screen of Death Error (PSOD)?

I'll connect to ILO\IDRAC\KVM depends on the HW model and will check the screen status on the console

I'll try to rebooting ESXi node. In the mean time I will check how VM's were rebooted by HA and will check the status of those VM's if they are in accessible or not.  

Meantime I will keep the ESXi node in Maintenance mode and raise a case with Vendor to fix the HW issues if there is any.

How do you perform ESXi upgrade from 6.5 to 6.7?

I will check the HW compatibility first whether it supports the ESXi OS or not

Downloaded the installation bundle from VMware site 

Upload the ESXi  ISO  image to the Datastore and I will create baseline in Update Manager.

Now keep ESXi host in maintenance mode.

After all VMs migrated to another host I will start updating the firmware 

After firmware is updated I will start the ESXi upgrade from VUM

from VUM I will attach the baseline  and remediate.

After its upgraded to 6.7  validate all the network\DS\vnics , and remove the Esxi from MM.

How do you troubleshoot performance related issues of ESXi?

I will log into the ESXi and check what processes or services utilizing more recourses. If I find any system processes utilization is abnormal I try to reboot the ESXi node and see if the performance issue is resolved. If the issue is still abnormal I'll open a case with VMware.

If  VM's are utilizing more resources in the cluster I will try to migrate few VM's from cluster to another cluster. 

How to troubleshoot network issues?

I'll check the cutsheet of the server and check which port is connected to which NIC.

Request Datacenter team to check whether the n/w cable has any cuts or SFP is properly working or not or is there any brakes to the pin.

If there is any issues with above cases then exchange the parts otherwise we will check whether it is a hardware issue means adopter is properly working or not.

It is issues with this then replace the adopter and check it is working or not. 

If it is ok, then issue solved otherwise we will raise a case with network team.

How do you fix network issues in VM?

I will check any recent changes performed on those VMS.

I will check any glitches or network errors on VOBD logs, from the logs I can see, it can be a hardware issue or VM level issue.

If it is a hardware issue I will go with vendor case and try to replace the NIC Adopters or SFP Modules.

If it is a VM level issue, I will check from port level, Is there any issue with it like any recent IP Changes or configuration changes.

Later I tried to migrate one VM to the next host and check the status of VM network, 

still it is not resolved I will engage with network team and ask them to check from network level, 

still network team also not resolved the issue, I will raise the VM ware case to check any bugs cause the issue.

Datastore high utilization troubleshoot and fix?

Upon checking the Datastore will verify the Datastores were connected with the clusters and look for any errors in it.

If the Datastore is high utilized , check for which VMs consume high data utilization and try to migrate the next DS available in same cluster. 

I will use scripts to get the snapshot files details first, if i found more snapshots will inform to os team to delete it.

If the particular Database having only single VM and its only utilizing high then split the VMDK files and balance the DS utilization

if the total Datastore in cluster are high then try to migrate vm by choose both live vmotion and svmotion option of few vm's from source to available datastores and recourses in different cluster if EVC enabled

if EVC not enabled and DS in fatal condition i will get the downtime from app team and migrate the few vs to free up the space in DS and last and final thing will req to add more storage on cluster

VMWare converter:

linux server migration :

First do the vlan validation and vlan trunking and Port group creation need to be done on destination VC for the vm's we are going to migrate

Ports need to be enable by taking help from network team for jump servers

get the free ip of vm

set the local root account

open vmware converter and login to the vm by using ip adress and provide the destination vc\ds\network details

later provide the free ip\subnet\gateway\dns details in ipv4

then submit the request

once it migrated, configure the eth files and reboot the server

once it comes online inform os and app team for post validations

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Windows server:

for windows we don't req free ip

set -local admin account and provide the destination vc, ds and network details. 

and submit the req once the migration done, vm will come online

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Steps for HCX migration?

Install the sential agent on all the migrating servers before start the activity

set the local root account

login to hcx manager tool and from choose the required option like

cluster\ds\network\os assisted migration and submit the job

wait till the migration completes

after the migration

power off the vm and register the vm in destination vc

assign vlan and power it on and do the ip setting

later do the svmotion and give the handover to app and os team for validations.

incase of vm fails, power off the vm from vc and delete and power it on from the source location.

DS disconnect or not available or inaccessible

first need to identify weather its NAS or SAN

if it is NAS i will try to ping the ip of the NAS from ESXi if its not reachable, i will request network team to check the issue mean while i will verify the hw end.

SAN - i will reach out storage team to rectify the issue parallelly raise an vmware and work with them also and i will verify the HW end