I have an ESXi server (version 3.5) with about 60 VMs. It has 2 hard disks, each of which is regarded as a datastore.

After upgrading through 'VMware Infrastructure Update' tool(still staying with 3.5 instead of 4.0) and a reboot, I can only see the 1st datastore. Hence many VMs are, now, inaccessible.

I wonder how I can get the 2nd datastore back. I am sorry, but I did't have the 2nd datastore backuped before.

BTW, I am still thinking of upgrading directly to version 4.0 to see if it can fix the driver problem. How about that?

UPDATE: My updating to version 4.0 failed with the following error message on the stage of 'Host Compatibility Check':
The boot device layout on the host does not support upgrade.

  • Are your disk controllers/disks on the 3.5 (or 4) HCL? – Chopper3 May 6 '10 at 8:33
  1. Set Configuration->Advanced Settings->LVM->EnableResignature to 1;
  2. Configuration->Storage Adapters->Rescan;
  3. Then you can find your original datastore in Configuration->Storage;
  4. Set Configuration->Advanced Settings->LVM->EnableResignature to 0;

Since you've changed the identifications of your datastores, you have to add your VMs back to your inventory manually.

via 'VMFS Volume Resignaturing' section of

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