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Error message: Cannot open root device. Please append a correct "root=" boot option

You see an error message similar to the following:

VFS: Cannot open root device "UUID:048b19c0-9850-4676-8b00-f42a6854427e" or 00:00
Please append a correct "root=" boot option
This issue may occur when:
- An ESX host experiences an abrupt reboot.
- Upgrading the BIOS or firmware of the ESX host.
- Upgrading or replacing the physical hardware of the ESX host.

The initrd file in /boot is corrupt.

Copy this file from another ESX host, or log into ESX in debug or maintenance mode and execute the commands:

esxcfg-boot -p (reloads the PCI data)
esxcfg-boot -b (sets up boot information)
esxcfg-boot -r (refreshes initrd)

To request a new product feature or to provide feedback on a VMware product, please visit the Request a Product Feature page.

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