Vmdk Corrupted [work] [Fresh | 2024]

for vmdk in $(find $DATASTORE_PATH -name " .vmdk" ! -name " -flat.vmdk"); do echo "Checking: $vmdk" >> $LOG_FILE

The CID (Content ID) was reset to fffffffe — a flag meaning "unknown or corrupted parent." The flat extent is intact, but the mapping is blind.

if [ ! -z "$FLAT_SIZE" ]; then CALC_MB=$(($FLAT_SIZE / 1024 / 1024)) echo "Health: $vmdk is $CALC_MB MB nominal." >> $LOG_FILE fi done VMDK corruption is rarely a hardware failure. It is a timing failure —where the hypervisor assumes a write completed before the storage array confirms it. The fix involves bypassing the broken descriptor and forcing a rebuild from the raw extent. Always keep a backup of the .vmdk descriptor file separately from the flat file. vmdk corrupted

vmkfstools -x repair /vmfs/volumes/datastore01/server01/server01.vmdk Output: "Failed to repair disk. Disk chain is inconsistent."

[SUCCESS] Grain table rebuilt. 1,892,471 sectors recovered. [WARNING] 204 sectors unrecoverable (log files, temporary data). The SQL database performs a recovery on mount. I lose 15 minutes of transaction log data. The business accepts the loss. To prevent this, implement a VMDK health check cron job on the ESXi host: for vmdk in $(find $DATASTORE_PATH -name "

#!/bin/bash # vmdk_integrity_check.sh # Checks for early signs of VMDK corruption DATASTORE_PATH="/vmfs/volumes/VM_Storage" LOG_FILE="/var/log/vmdk_health.log"

# Verify descriptor matches flat extent size DESCRIPTOR_SIZE=$(grep "RW" $vmdk | awk 'print $2') FLAT_SIZE=$(stat -c %s $vmdk%-flat.vmdk.vmdk 2>/dev/null) -z "$FLAT_SIZE" ]; then CALC_MB=$(($FLAT_SIZE / 1024 /

# Check for zeroed CID (Corruption flag) CID=$(grep "CID=" $vmdk | cut -d'=' -f2) if [ "$CID" == "fffffffe" ]; then echo "ALERT: $vmdk has invalid CID. Possible corruption." >> $LOG_FILE /usr/bin/vmkfstools -x check $vmdk >> $LOG_FILE fi