ESXI 6.7: Raid5 Rebuild - Datastore Gone

Hi,

I had an error with the RAID5 and a rebuild was in order leading to ESXI 6.7.0 Update 1 (Build 10302608) not finding any datastore anymore.

I can see a large VMFS partition in the ESXI WebClient (ESXI runs on a dual SD), same size as reported on ssh.

Things I tried so far

1. Header-Dump: dd if=/dev/disks/naa.6848f690eeefc30022cfdde30c008b3e:1 bs=1M count=2000 | gzip -c >  /tmp/vmfs-header-dump.2000.gz
   dd: /dev/disks/naa.6848f690eeefc30022cfdde30c008b3e:1: Input/output error
2. Check VMFS: voma -m vmfs -f check -d /vmfs/devices/disks/naa.6848f690eeefc30022cfdde30c008b3e:1
   Checking if device is actively used by other hosts
   Scanning for VMFS-6 host activity (4096 bytes/HB, 1024 HBs).
   Running VMFS Checker version 2.1 in check mode
   Initializing LVM metadata, Basic Checks will be done
   Phase 1: Checking VMFS header and resource files
      Detected VMFS-6 file system (labeled:'vDisk-SCH1') with UUID:5b3d25fb-0ef169f2-a1e7-90b11c49510d, Version 6:82
   ON-DISK ERROR: Unexpected 'parentResourcesPerCluster' 1238287, expected 0
   ON-DISK ERROR: Unexpected 'numClusterGroups' 8, expected 33554441
   Checking VMFS header and resource files..-Segmentation fault

I'm stuck ... does anyone have any ideas ? Is my data gone?

thanks so much!!!