Use UFS Explorer – it automatically detects VMFS5/6 and can rebuild the partition table. Scenario B: Corrupted VMFS Metadata (Superblock, File Allocation) Symptoms: Datastore shows as "Unmounted" or "Corrupt," VMs missing, but LUN size correct.
If the partition table is missing but the device exists, VMFS metadata may still be recoverable. Scenario A: Accidental Deletion of Datastore (but not reformatted) When you "delete" a datastore in vSphere, only the VMFS volume header and UUID are removed. Data remains until overwritten. recovering vmfs datastore
Always test recovery steps on a dummy LUN before attempting on production data. Use UFS Explorer – it automatically detects VMFS5/6
# Find VMFS partition start (in sectors) using a hexdump dd if=/dev/disks/naa.XXX of=/tmp/header bs=512 count=2048 | hexdump -C | grep "VMFS" Recreate partition entry (example: start sector 2048, end sector auto) partedUtil set /vmfs/devices/disks/naa.XXX 1 2048 <end> 0 Scenario A: Accidental Deletion of Datastore (but not
vim-cmd storage/vmfs_mount_snapshot <snapshot-uuid> <datastore-name> # Check if the device appears esxcli storage core device list -d naa.600601605a281800 Check partition table partedUtil get /vmfs/devices/disks/naa.600601605a281800
Use UFS Explorer – it automatically detects VMFS5/6 and can rebuild the partition table. Scenario B: Corrupted VMFS Metadata (Superblock, File Allocation) Symptoms: Datastore shows as "Unmounted" or "Corrupt," VMs missing, but LUN size correct.
If the partition table is missing but the device exists, VMFS metadata may still be recoverable. Scenario A: Accidental Deletion of Datastore (but not reformatted) When you "delete" a datastore in vSphere, only the VMFS volume header and UUID are removed. Data remains until overwritten.
Always test recovery steps on a dummy LUN before attempting on production data.
# Find VMFS partition start (in sectors) using a hexdump dd if=/dev/disks/naa.XXX of=/tmp/header bs=512 count=2048 | hexdump -C | grep "VMFS" Recreate partition entry (example: start sector 2048, end sector auto) partedUtil set /vmfs/devices/disks/naa.XXX 1 2048 <end> 0
vim-cmd storage/vmfs_mount_snapshot <snapshot-uuid> <datastore-name> # Check if the device appears esxcli storage core device list -d naa.600601605a281800 Check partition table partedUtil get /vmfs/devices/disks/naa.600601605a281800