Mirco Lueneburg

Mirco Lueneburg

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Posts by Mirco Lueneburg

Cisco UCS and Cisco FlexFlash unhealthy RAID


The status of the RAID of the Cisco FlexFlash becomes unhealthy (has a degraided RAID) when installing a second or switching a SD Card in a Cisco UCS server.

This indicates that the HV partitions are not synchronized.

Here´s the link to this bug:



You can find further Information regarding the Cisco FlexFlash via following link:


Installation of the GUI for Windows Server 2016 Technical Preview 2


If you enter the following PoSh commands on your Windows Server 2016 TP2 you can install the “full” GUI for this system:

get-windowsimage -imagepath InstDriveLetter:\sources\install.wim
install-windowsfeature server-gui-mgmt-infra,server-gui-shell -source:wim:InstDriveLetter:\sources\install.wim:2

Keep in mind that you have to change InstDriveLetter to your drive which contains the Windows-Install-ISO (or disc)

Migration of VMware Horizon View databases


Some weeks ago I had to migrate our View databases to another SQL server.

Here´s my little guide to migrate the databases:

View Composer

  1. Stop Composer service
  2. Back up and move the database to the new database server
  3. Update the database connection with new server [Start > Administrative Tools > Data Sources (ODBC) > System DSN]
  4. Start Composer service

View Events

  1. Move the database
  2. Log in to View Administrator and navigate to View Configuration > Event Configuration
  3. Select “Edit…” in the Event Database section
  4. Update the fields with information from the new server and hit OK.

Prevent AD objects from accidental deletion via PoSh


Here are some One-Liners to prevent your Active Directory from accidental deletion.

User objects:

Get-ADObject -filter {(ObjectClass -eq "user")} | Set-ADObject -ProtectedFromAccidentalDeletion:$true

Organizational units:

Get-ADOrganizationalUnit -filter * | Set-ADObject -ProtectedFromAccidentalDeletion:$true

Unmounting/Deleting a datastore used for Host Cache on ESXi 5.5 fails


When you are trying to unmount/delete a datastore you can get on of the following error messages:

Cannot unmount volume <datastore> because file System is busy


Cannot delete volume <datastore> because file System is busy


To resolve this issue proceed as follows:


If you are not using VSAN:

1. Connect to your ESXi Host via SSH

This Service isn´t enabled by default. You can enable it

a. with the vSphere Client: in the Security Profile in the Configuration tab of your ESXi Host

b with the Web Client: in Manage -> Settings -> Security Profile of your ESXi Host

2. Stop the vsantraces by running the command:

#/etc/init.d/vsantraced stop

3. Perfom a Refresh for Storage

4. Unmount/Delete the datastore.

5. Start the Service by entering the following command:

#/etc/init.d/vsantraced start


To permanently turn off this Service run the following command:

chkconfig vsantraced off


If you are using VSAN:

1. Run this command to change the Location of the VSAN trace:

# esxcli vsan trace set -p <datastore>

2. Unmount/Delete the datastore


Source and further information: http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2069171


Error “e-port segmented (zone conflict)” on Brocade FC switch


If you´re getting this error it´ll be possible that you have different (old/new) configs on your switch. Compare your configs via cfgshow and check if there are any differences.


If there are differences enter following commands and confirm them on the switch with the oldest config:





portdisable <Port No.>

portenable <Port No.>


After this your fabric should be up and running again.


Removing GPO from a Non-AD-member



It is possible to remove GPO settings from a pc
You can remove the GPOs from a computer which was previously in an active directory domain by deleting
the S-x-x-xx-xxxxxxxx-…-keys in HKLM\Software\microsoft\windows\currentversion\group policy\ and within containing subfolders.

IBM Notes/Domino 9.0.1 online


IBM has released Version 9.0.1 of their Notes/Domino release.

If you have a valid subscription you can download it via Passport Advantage

Locked and disabled Users in Active Directory


At first… Here is the default procedure to create a saved query:

– Open Active Directory Users and Computers.

– In the console tree, right-click Saved Queries.

– Point to New, and then click Query.

– In Name, type a query name.

– In Description, type a query description.

– Click Browse to define the container from which to begin your search.

– Click Define Query to define your query.

Here are the query definitions:

Locked Users:


Disabled users:


Unmount CD-Drives using PowerCLI


In some cases it would be good to know that your VMs don´t have an ISO-File or Host device configured e.g. if you want to vMotion some VMs to another Host. Here´s how you could solve this problem:

[vSphere PowerCLI] C:\Program Files (x86)\VMware\Infrastructure\vSphere PowerCLI> Get-VM | Get-CDDrive | 
Set-CDDrive -NoMedia -Connected:$false -StartConnected:$false -Confirm:$false
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