Cannot open the disk Reason: The parent virtual disk has been modified since the child was created.

If you get the following error when starting a virtual machine you can try the solution given below: “Message on VMName: Cannot open the disk ‘/vmfs/volumes/Volume-ID/VM Name/VMName-000001.vmdk’ or one of the snapshot disks it depends on. Reason: The parent virtual…
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How to – run vCenter Server and database server on a dedicated host

If you run your vCenter server and the associated database server virtually, you normally want to control on which host they are situated. Since vSphere 4.1 this is possible with the help of a feature called DRS Groups Managers. In…
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How to – Reclaim Dead Space from Thin Provisioned VMFS Datastores

If you use thin provisioned VMFS datastores you will maybe face the problem that unused space on the storage is not released automatically when you delete or migrate a virtual machine. For example: A virtual machine is migrated from one…
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How to – Install and configure vCenter Operations Manager 5.0.2

Since february 2011 vCenter Operations Manager (vCOPS) from VMWare is available. In comparision to other performance and capacity management tools (Veeam Monitor, vKernel vOPS,…) some important functions were missing in Version 1.0. These deficits were caught up with the latest…
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