Vmfs: Data Recovery !!top!!

Before attempting any recovery, follow these rules to prevent permanent data loss:

The first rule of VMFS recovery is to stop all write operations. Because VMFS is a high-performance system, ESXi may quickly overwrite deleted blocks with new log files or swap data. The recovery process generally follows these steps:

Do not attempt to repair the datastore in place without a backup. Always work from a or a clone. vmfs data recovery

This is where VMFS recovery becomes an intricate engineering challenge. Structural recovery occurs when the VMFS file system itself is corrupted, deleted, or inaccessible. This can happen due to:

Unlike traditional file systems like NTFS or EXT4, which manage files for a single operating system, VMFS is a clustered file system designed to manage storage resources for multiple hosts simultaneously. This architectural complexity makes data recovery in VMFS a distinct discipline, separated into two divergent paths: the logical recovery of files within a virtual machine, and the structural recovery of the VMFS volume itself. Before attempting any recovery, follow these rules to

If the data is critical (e.g., hospital records, financial databases), stop your own attempts and contact a professional lab with VMware expertise. However, for most sysadmins, the tools above will bring your missing VMDKs back to life.

When a VMFS datastore is corrupted, it is usually the metadata region that has failed. The actual data—the VMDK files—often remains untouched on the physical disk blocks. The file system has simply "lost the map" to the treasure. Always work from a or a clone

If a datastore is removed from an ESXi host improperly, the "lock files" may persist on the storage. When attempting to mount the volume for recovery, the file system may refuse access because it believes the volume is still owned by a missing host.

Sometimes the data is intact, but the file system metadata is broken. Try these ESXi console commands first: