VM Migration error between hosts

VM migration error from one host to another host:

Error 1



When I try to migrate a VM from one host to another host which is on a different cluster, I got the above error. Per VMware, this can be ignored.

Error 2




Second error can also be ignored per VMware.


Up time / down time – 99.9999% means what ?

Please check the excellent article in Wiki: https://en.wikipedia.org/wiki/High_availability

You can see the up time / availability in web site hosting, Amazon Web Services and in many places but what that actually means ?

Below picture explains it better than multiple paragraphs.


Reliability Monitor

I recently discovered one hidden gem in Windows albeit lately… it is Reliability Monitor

How do you see what caused an issue with the computer in the past ? You can use Event viewer in general but it is tedious. Windows 7 or Windows 2008 R2 and above you can use Reliability Monitor. This is a GUI and OS built-in tool. Also very easy to use.

How to access this application, Press Windows Key and type Reliability




If vCenter goes down – what will work and what doesn’t ?

Things that continue to work if vCenter is down:

  • Fault Tolerance will continue to work for the configured VMs. However, in case of a failover, no new secondary VMs will be created.
  • HA will continue to work
  • You can take snapshot of the VM by connecting to the ESXi host using vSphere client
  • VMs will continue to work
  • dvSwitch will continue to work
  • vSwitch will continue to work

What will not work?

  • vMotion will not work since vMotion requires vCenter server
  • Storage vMotion will not work
  • DRS will not work since DRS requires vMotion.
  • You cannot deploy VMs from templates
  • You cannot clone a VM



Important services in Windows Domain controller

Active Directory Domain Services

AD DS domain controller service. If this service is stopped, users will be unable to log on to the network.

Provides domain controller service. Stopping the service will stop the server acts as a Domain controller.

Active Directory Web Services

Provides web service interface to  AD DS and AD LDS (Lightweight Directory Service) that running locally on this server.

Required for AD PowerShell module, AD Administrative center to work.

DHCP client

This service is responsible for registering IP addresses and DNS records for this computer. If this service is stopped, this computer will not receive DHCP IP address and DNS updates.

File Replication Service (FRS)

Synchronizes folders with file servers that use FRS instead of newer DFS replication technology.

Distributed File System Replication (DFSR)

DFSR is used to replicate contents of SYSVOL between domain controllers. SYSVOL contains Group Policy, logon and logoff scripts (if any). Stopping this service will have effect on Group Policies, logon and logoff scripts etc.

DFSR replaces FRS starting with Windows server 2008.

In Windows Server 2008 R2, File Replication Service (FRS) cannot be used for replicating Distributed File System (DFS) folders or custom (non-SYSVOL) data. A Windows Server 2008 R2 domain controller can still use FRS to replicate the contents of the SYSVOL share in a domain that uses FRS for replicating the SYSVOL share between domain controllers. However, Windows Server 2008 R2 servers cannot use FRS to replicate the contents of any replica set apart from the SYSVOL share.

DNS Client

This service caches DNS names and registers the full computer name for this computer.

DNS Server

Provides Name resolution service to clients by answering DNS queries and dymanic DNS update requests. If this service is stopped, DNS updates will not occur.

Kerberos Key Distribution Center (KDC)

On DC this service enables users to log on to the network using Kerberos authentication protocol.


Maintains a secure channel between this computer and the domain controller for authenticating users and services.This secure channel is used for authentication (Kerberos and NTLM) and DC replication.

If this service is stopped, the computer may not authenticate users and services and the domain controller cannot register DNS records.

  • This service is responsible for creating Secure Channel between Domain Controllers and client computers. Secure Channel is created to pass the authentication packets.
  • Service performs the registration of SRV records, CNAME and other DC records in the DNS Server to advertise the availability of Domain Controllers in the domain.
  • SRV Records registered by NetLogon Service are stored in C:\Windows\System32\Config\NetLogon.DNS File.
  • Performs registration of SRV Records every 24 hours depending on the version of Operating System in use.
  • Registers the SRV Records for a site where there is no Domain Controller. This is called Site Coverege.

Remote Desktop Services

Allows users to connect interactively to a remote computer. Remote Desktop and Remote Desktop session Host Server depend on this service.

Windows Time

Maintains date and time synchronization on all clients and servers on the network.

Acts as Network Time Protocol (NTP) client and NTP time server. w32time.exe command line tool for troubleshooting issues such as computer is unable to sync time with authoritative source.


Info from Various sources including


How to remove selective lines in Notepad++

I wanted to remove selective lines from Notepad++. The problem was, except for one word, all other words in the line were different to each other. Below steps helped me to accomplish this task.


  • Goto the search menu Ctrl+F and there to the "Mark" tab. Check "Bookmark line" (if there is no "Mark" tab update to the current version).
  • Then just enter your search term and click "Mark All"

    ==> All line containing the search term are bookmarked.

  • Now go to the Menu "Search -> Bookmark -> Remove Bookmarked lines"
  • Done.

Source: http://stackoverflow.com/questions/5876296/regex-remove-lines-containing