Recover Vmfs Datastore May 2026

Step 4: She used dd to copy that backup block over the primary superblock (after making a full LUN image with ddrescue to a separate 12-TB drive—insurance). # dd if=/dev/sde1 bs=1M skip=512 count=1 of=primary_superblock_backup.bin Then, using vimfstools (from a recovered ESXi maintenance mode session): # vmkfstools -B recover /vmfs/devices/disks/naa.6000...:1

Step 2: Use vmfs-fuse to try a read-only mount. # vmfs-fuse /dev/sde1 /mnt/recover → failed: "Unsupported VMFS version or corrupted heartbeat region" . recover vmfs datastore

Step 3: Deeper scan. She ran vmfs6-recover (part of vmfs-tools ). It parsed backup VMFS metadata—the first copy of the file system descriptor had been overwritten when the host re-scanned the "new" LUN, but VMware stores a second copy at offset 512 MB. Step 4: She used dd to copy that

Step 5: Mount attempt on ESXi: # esxcli storage vmfs snapshot mount -l Prod-HighSpeed Step 3: Deeper scan

It was 2:00 AM on a Tuesday—the universal witching hour for IT disasters. Maya, a senior storage administrator, was jolted awake not by her pager, but by the eerie silence of her monitoring dashboard going dark. Then the texts came: “ESXi hosts lost connectivity to datastore ‘Prod-HighSpeed’.”