Trusted Partner for VMware Data Recovery

Vmware/ Virtual Machine Data Recovery

Virtualization brings an extra layer of complexity to a host system and when data loss occurs within a virtual machine, it is critical to select a provider experienced in VMware data recovery.

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Ontrack is the only recommended company in Hong Kong to offer comprehensive data recovery solutions for VMware vSphere virtual systems.

Data Types vSphere Recovery

Our first priority is to assist you to prevent further data loss.

Contact us on
+852 3704 8688
immediately for a free data recovery consultation.

Reasons for Data Loss in Virtual Systems

The most common data loss situations in virtual environments are:

  • Re-formatted VMware, 'Datastore' which stores all of the files associated with the virtual computer volume
  • Corrupted virtual disk files (VMDK)
  • Corrupt VMFS datastore volumes
  • Deleted virtual disk files (VMDK)
  • Corrupted file systems
  • Traditional RAID and hardware failures

A close partnership with VMware

Ontrack has been a VMware partner since 2008 and in that time have successfully conducted over 1,000 specialised VMware data recoveries . We partner directly with VMware support services to ensure we offer you the latest technology available to recover your data.

4 most common scenarios for VMware data recovery

Deleted or Missing Virtual Machine/VMDK

If you suspect data loss the first requirement is to record any information you know about the missing or deleted Virtual Disk. Relevant data includes: Virtual Disk size, thick or thin provisioning, VM name, Guest File System and the type of data contained.

Next, reduce reads and writes to the affected Datastore. If the Datastore contains active, thin provisioned Virtual Machines, power them down as soon as possible. Whatever you do, don't migrate any active VM (Storage vMotion or otherwise) to or from the affected Datastore without first speaking to a Data Recovery professional. You may unwittingly increase the complexity of the VMware data recovery and could reduce the chances of retrieving the data.

In case of a VM with missing or deleted snapshots, don't power it on. And if the machine is currently running, power it down as soon as possible.

Corrupt VMFS Metadata or inaccessible Datastore

To minimise problems, never attempt to recreate the datastore and if you are investigating the LUN yourself, ensure that Read Only access is used.

Mechanical failures and RAID/Storage issues

Never replace a failed drive with a drive that was part of a previous RAID system; always zero out the replacement drive before using it. If the drive is making unusual mechanical noises, turn it off immediately and get assistance. Just as in the physical server environment, leaving a mechanically failing drive powered on increases the likelihood of further damage and significantly reduces the chances of a full recovery.

Tip: Label the drives with their position in a RAID array before removing them from your system.

If a RAID system fails in the middle of a rebuild process, do not run further rebuild attempts. Never migrate VMs to or from a suspect RAID, and if you do need to shut down or power cycle your RAID hardware, ensure all VMs and VMware hosts are gracefully shut down first.

Corruption inside Guest OS

Don't try to run volume repair utilities (such as CHKDSK) or defragmenter utilities on suspected corrupt Virtual Disks as this can exacerbate problems.

If you find that more than one VM shows signs of corruption, you may have a problem at the storage level. Power down the machines and consult a VMware data recovery professional as soon as possible.


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Our first priority is to prevent further data loss

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Important: If virtual disk files or data are part of a data loss event, it is important to stop using the host server datastore volume and assess the situation before deciding on the best course of action. One option would be to contact Ontrack and discuss the situation with a specialist virtual data recovery engineer.

Data loss failure nodes within the virtualised environment happen in the storage level, the host server's file system level, or within the virtual disk file itself. In some cases, all of these failures happen at once.

Data Loss on VMware and other Hypervisors

Following a data loss, the risk of continuing to use a virtual host server datastore volume is that virtual disk file data may be overwritten. Many administrators of virtual computer systems use "thin-provisioning" or other data reduction technologies. This technology grows the virtual disk files on an as-needed basis.
When a data loss happens on a virtual host server, other virtual disk files may grow and overwrite the original data that was lost.

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Ontrack was the first data recovery provider to develop solutions for virtualised environments. With 125 data recovery engineers worldwide in over 20 office locations, Ontrack Data Recovery services are trusted by thousands of organisations and users.

The patented Remote Data Recovery service from Ontrack® Data Recovery is the most secure and fastest way to search and restore the original data on a host server's datastore volume. Ontrack engineers understand how data within virtual disk files and datastore volumes is written and what to do to restore critical data that is no longer accessible. Strong relationships with OEMs, such as VMware help our Research and Development team to develop pioneering solutions for complex virtual environments.

If you have experienced any kind of data loss on your virtual machine, contact us on +65 6296 5131 immediately for a free data recovery consultation - our first priority is to assist you in preventing further data loss.


Call us +852 3704 8688

Call us today for more information or a free consultation

Request Free Online Quote

Data Loss on Microsoft Hyper-V, Citrix Zen and other Hypervisors

Ontrack is the only company to offer comprehensive data recovery solutions for Microsoft Hyper-V, Oracle VM VirtualBox and Citrix XenServer as well as VMware vSphere virtual systems.

With increasing development activity and product launches, Microsoft, Oracle and Citrix continue to grow as leading providers of virtual platforms.

Common Causes of Virtual Data Loss

  • Careless implementation of virtual platforms.
  • Mismanagement of proprietary data.
  • NTFS corruption.
  • Traditional RAID and hardware failures.
  • Deleted or corrupt files contained within VHDs.

If you have experienced a Microsoft Hyper-V or virtual machine data loss, contact us immediately on +65 6296 5131 for a free consultation and an obligation-free quote. Our main priority is to assist you in preventing further irreparable data loss.

Microsoft Hyper-V Data Recovery

Our Ontrack Data Recovery engineers have developed industry leading Microsoft Hyper-V data recovery techniques to help manage our client's virtual data loss scenarios. Our engineer's knowledge of the Microsoft Hyper-V file system and traditional recovery techniques combine to deliver a dynamic deep-dive NTFS and VHD host and guest OS level data recovery service.

Data loss situations

Ontrack Data Recovery services can recover virtual data from the following situations:

  • Ontrack Data Recovery services can recover virtual data from the following situations:
  • Corrupt NTFS Volumes
  • Corrupted Virtual Hard Disks (VHDs)
  • RAID or other hardware failures
  • Accidental data deletion


Call us +852 3704 8688

Call us today for more information or a free consultation

Request Free Online Quote