Nov 14 2014

How to Change Disk Status From Reserved to Online on Windows

Category: VMware,WindowsFatih Acar @ 18:02

I took a clone backup for windows failover cluster system from vmware system which used raw disks. Raw disks automatically converted to vmdk disk via vmware. I restored this clone backup as new standalone server. I started system but my disks were reserved status and I could not use these. I implemented below steps to convert disk status from reserved to online.

Error

diskpart_0

Solution
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Tags: Cluster Systems, Disk Status Convert, Reserved Disk to Online Disk, System Administration, Windows Cluster Disks


Sep 18 2014

Error: Cluster Disk 1 Does Not Support Persistent Reservations.

Category: VMware,WindowsFatih Acar @ 15:21

While I was installing Windows Failover Cluster system, I got an error like “Cluster Disk 1 does not support persistent reservations.”. If you are attempting to set up a Cluster in a Single Host, and the shared disk (or disks) for the cluster is RDM (Raw Device Mapping, or Raw Disk Mapping), in Physical Compatibility Mode. If this is the case, you can either change the disks to Virtual Compatibility mode, or if you wish to use Physical Compatibility Mode, the cluster nodes must be on different hosts. My case was that.

Other Cause For This Error

  • If the storage array is not configured correctly to support SCSI-3 compliant commands.
  • A third-party plug-in is interfering with the SCSI reservation process (such as the PowerPath/VE PSA).
  • If virtual machines are running under the MSCS configuration on two separate ESX/ESXi hosts, and the .vmdk files are on a VMFS datastore which is configured as physical bus sharing mode.

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Tags: Cluster Systems, System Administration, VMware, VMware Administration


Dec 23 2013

VMware SCSI Bus Sharing Options

Category: VMwareFatih Acar @ 10:58

You can set the type of SCSI bus sharing for a virtual machine and indicate whether the SCSI bus is shared. Depending on the type of sharing, virtual machines can access the same virtual disk simultaneously if the virtual machines reside on the same ESXi host or on a different host.

SCSI Bus Sharing Options

None
Virtual disks cannot be shared by other virtual machines.

Virtual
Virtual disks can be shared by virtual machines on the same ESXi host.

Physical
Virtual disks can be shared by virtual machines on any ESXi host.

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Tags: System Administration, VMware, VMware Administration


Nov 01 2013

VMware Virtual Disk Provisioning Policies

Category: VMwareFatih Acar @ 16:55

When you perform certain virtual machine management operations, such as creating a virtual disk, cloning a virtual machine to a template, or migrating a virtual machine, you can specify a provisioning policy for the virtual disk file. NFS datastores with Hardware Acceleration and VMFS datastores support the following disk provisioning policies. On NFS datastores that do not support Hardware Acceleration, only thin format is available. You can use Storage vMotion to transform virtual disks from one format to another. If a virtual disk supports clustering solutions such as Fault Tolerance, do not make the disk thin. If the thin disk needs more space later, it can grow to its maximum capacity and occupy the entire datastore space provisioned to it. Also, you can manually convert the thin disk into a thick disk.

thin-provisioning

Thick Provision Lazy Zeroed

Creates a virtual disk in a default thick format. Space required for the virtual disk is allocated when the virtual disk is created. Data remaining on the physical device is not erased during creation, but is zeroed out on demand at a later time on first write from the virtual machine.
Using the default flat virtual disk format does not zero out or eliminate the possibility of recovering deleted files or restoring old data that might be present on this allocated space. You cannot convert a flat disk to a thin disk.

Thick Provision Eager Zeroed

A type of thick virtual disk that supports clustering features such as Fault Tolerance. Space required for the virtual disk is allocated at creation time. In contrast to the flat format, the data remaining on the physical device is zeroed out when the virtual disk is created. It might take much longer to create disks in this format than to create other types of disks.

Thin Provision

Use this format to save storage space. For the thin disk, you provision as much datastore space as the disk would require based on the value that you enter for the disk size. However, the thin disk starts small and at first, uses only as much datastore space as the disk needs for its initial operations.

Source : VMware Offical Documents

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Tags: System Administration, VMware, VMware Administration