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Lost data after VM restart

hi,

  I have a server hosted by another company. It is VM server on vSphere 4.0 with RAW disks connected, only system partition is also virtual.
  Today when I restarted Windows 2008 on server, I have lost all the files from RAW disks saved after 15:30 yesterday. File recovery tools does not show any tracks of them at all, and for sure they were there before restarts. For example some logs which I have been browsing.
 What can be the reason? I am VM greenhorn, but I found some documentation saying about nonpersistent mode of disks, where data exist only until VM reset. Is it the case?
  Just to mention that system partition data (virtual disk) has not been affected.

Please give me any hints, just want to know the reason.
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szczecin
Asked:
szczecin
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2 Solutions
 
PMP_AdminCommented:
Is the third party IT firm set-up to backup the VMs nightly? If so then it may have been an error linked with this opperation and maybe they have a recovery image for your data
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Do you have your virtual disks set to non persistant?

You are not using snapshots, and reverted back?
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szczecinAuthor Commented:
the problem is, we do not have access to those settings. If you could just tell me possible reasons. As I see the VM was not turned off in the meantime.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
If you have no access to settings, it will be difficult to diagnose.

1. if the disks are setup as non persistant, changes will be lost.

2. if snapshots were being used by third party backup applications, its possible data loss could occur due to incorrect snapshot use.

3. in correct storage device used in vm could possible cause issues.

4. hosting company could have performed a restore to an earlier date

5. hosting company could have performed a Storage vMotion, and if snapshot existed could have caused issues.

difficult to come to a conclusion without access or evidence.
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szczecinAuthor Commented:
We could ask for logs but not sure what logs could provide such informations ?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
What have the hosting company stated the reason for data loss?
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szczecinAuthor Commented:
nothing, they seem to be just home-learned people. Actually it's not a hosting company but company for which we deliver software. As far as we know, they have only basic knowledge on VMs
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
We would need far more information than logs, storage setup, SAN setup.

Ask the hoster the question why?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Time to move your hosting, if they have no expertise.

We would need to have full disclosure of how VMware is setup.

Do you know what the setup is? What are the terms of the Contract, Service Level Agreement?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Possible reasons are listed above, I would suggest checking server, restarting and see if data is missing.

It could be theyve had issues they are not informing you off.
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