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Event id 55 file system structure on the disk is corrupt within a Virtual Machine

Hello, I have the following problem, and was wondering if someone else had some experience with this:

Got a VMware ESX 3.0.1 32039 server. Have 5 Windows 2003 SP2 Virtual Machines. And 3 of them have in their Windows System Event Log the error 55: The file system structure on the disk is corrupt and unusable. Please run the chkdsk utility on the volume C:. I'm really not sure what happened to the servers, but is there anybody who can give some advice on this one? I was thinking about a problem with the physical harddisk in the ESX server or problems within the vmdk file of the VM.

Hope someone can give some help.

Thanks in advance.

Erwin
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Halindar
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tengage

Additionally,

I think that the volume's shadow copies are causing my pain.  I am curious if you do have Shadow copies enabled for the affected volumes, do you have a cap on the size of the VSS?  Do you have issues getting backup software to backup the volumes?  And lastly, do you have any VSS errors in the application or system log?

In case anyone reading is wondering, Shadow copies are point-in-time snapshots of a volume.  If a user deletes some data off of a share, you can recover it without tape.  Events are from source VolSnap or VSS Writer.  VSSAdmin is a useful tool for administering it.  The Previous Versions client can be installed and ships with Vista.  Right clicking a directory in a share will provide a "previous versions" tab where a user can go back in time and view / restore files that they have access to.
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Thanks for your replies. We build a new VM, with the same config as the VM with the file structure problems. So we replaced the old one with the new. I did not have time to investigate the problem thorough, and wanted to be sure the old VM did not got "out of order".