Rebootet habe ich den Host. 
1. Wenn ich zuerst die neue "NAS" VM starte, dann kommt der Fehler wegen dem Sperren nicht, 
2. Wenn ich dann erst die Firewall-VM starte: auch gut.
3. Wenn ich dann die NAS VM beende und eine Weile warte und dann wieder versuche zu starten kommt wieder: "Die Festplatte '/vmfs/volumes/XXX.vmdk' oder eine der Snapshot-Festplatten, auf die sie angewiesen ist, konnte nicht geöffnet werden. Datei konnte nicht gesperrt werden"
Somit sehe ich zwei Probleme:
a)  Was (vermutlich aus der Firewall-VM) sperrt mein VMDK/ Platte ?
b) Denke auch mit vmhba34 gibt es ein Problem. Nur ist mir unklar ob das ein HW Problem ist ist.  vmhba34 liegt auf: t10.ATA_____WDC_WD40EFRX2D68WT0N0_________________________WD2DWCC4E3NA1C0X
PS. Sorry für den langen Quote. Wenn euch das lieber ist könnte ich den Text auch auslagern...
vmhba34 
   Successful Commands: 619 
   Blocks Read: 368 
   Blocks Written: 0 
   Read Operations: 138 
...
   Failed Commands: 204780 
   
Code: Alles auswählen
[root@esxi:/vmfs/volumes/55a7c30e-b2691c04-57ee-a01d48c70bec] esxcli storage core device list 
t10.ATA_____WDC_WD40EFRX2D68WT0N0_________________________WD2DWCC4E6RKT37L
   Display Name: Local ATA Disk (t10.ATA_____WDC_WD40EFRX2D68WT0N0_________________________WD2DWCC4E6RKT37L)
   Has Settable Display Name: true
   Size: 3815447
   Device Type: Direct-Access 
   Multipath Plugin: NMP
   Devfs Path: /vmfs/devices/disks/t10.ATA_____WDC_WD40EFRX2D68WT0N0_________________________WD2DWCC4E6RKT37L
   Vendor: ATA     
   Model: WDC WD40EFRX-68W
   Revision: 82.0
   SCSI Level: 5
   Is Pseudo: false
   Status: on
   Is RDM Capable: false
   Is Local: true
   Is Removable: false
   Is SSD: false
   Is VVOL PE: false
   Is Offline: false
   Is Perennially Reserved: false
   Queue Full Sample Size: 0
   Queue Full Threshold: 0
   Thin Provisioning Status: unknown
   Attached Filters: 
   VAAI Status: unknown
   Other UIDs: vml.0100000000202020202057442d574343344536524b5433374c574443205744
   Is Shared Clusterwide: false
   Is Local SAS Device: false
   Is SAS: false
   Is USB: false
   Is Boot USB Device: false
   Is Boot Device: false
   Device Max Queue Depth: 31
   No of outstanding IOs with competing worlds: 32
   Drive Type: unknown
   RAID Level: unknown
   Number of Physical Drives: unknown
   Protection Enabled: false
   PI Activated: false
   PI Type: 0
   PI Protection Mask: NO PROTECTION
   Supported Guard Types: NO GUARD SUPPORT
   DIX Enabled: false
   DIX Guard Type: NO GUARD SUPPORT
   Emulated DIX/DIF Enabled: false
t10.ATA_____WDC_WD40EFRX2D68WT0N0_________________________WD2DWCC4E0AA8LS6
   Display Name: Local ATA Disk (t10.ATA_____WDC_WD40EFRX2D68WT0N0_________________________WD2DWCC4E0AA8LS6)
   Has Settable Display Name: true
   Size: 3815447
   Device Type: Direct-Access 
   Multipath Plugin: NMP
   Devfs Path: /vmfs/devices/disks/t10.ATA_____WDC_WD40EFRX2D68WT0N0_________________________WD2DWCC4E0AA8LS6
   Vendor: ATA     
   Model: WDC WD40EFRX-68W
   Revision: 82.0
   SCSI Level: 5
   Is Pseudo: false
   Status: on
   Is RDM Capable: false
   Is Local: true
   Is Removable: false
   Is SSD: false
   Is VVOL PE: false
   Is Offline: false
   Is Perennially Reserved: false
   Queue Full Sample Size: 0
   Queue Full Threshold: 0
   Thin Provisioning Status: unknown
   Attached Filters: 
   VAAI Status: unknown
   Other UIDs: vml.0100000000202020202057442d5743433445304141384c5336574443205744
   Is Shared Clusterwide: false
   Is Local SAS Device: false
   Is SAS: false
   Is USB: false
   Is Boot USB Device: false
   Is Boot Device: false
   Device Max Queue Depth: 31
   No of outstanding IOs with competing worlds: 32
   Drive Type: unknown
   RAID Level: unknown
   Number of Physical Drives: unknown
   Protection Enabled: false
   PI Activated: false
   PI Type: 0
   PI Protection Mask: NO PROTECTION
   Supported Guard Types: NO GUARD SUPPORT
   DIX Enabled: false
   DIX Guard Type: NO GUARD SUPPORT
   Emulated DIX/DIF Enabled: false
t10.ATA_____WDC_WD40EFRX2D68WT0N0_________________________WD2DWCC4E3NA1C0X
   Display Name: Local ATA Disk (t10.ATA_____WDC_WD40EFRX2D68WT0N0_________________________WD2DWCC4E3NA1C0X)
   Has Settable Display Name: true
   Size: 3815447
   Device Type: Direct-Access 
   Multipath Plugin: NMP
   Devfs Path: /vmfs/devices/disks/t10.ATA_____WDC_WD40EFRX2D68WT0N0_________________________WD2DWCC4E3NA1C0X
   Vendor: ATA     
   Model: WDC WD40EFRX-68W
   Revision: 82.0
   SCSI Level: 5
   Is Pseudo: false
   Status: on
   Is RDM Capable: false
   Is Local: true
   Is Removable: false
   Is SSD: false
   Is VVOL PE: false
   Is Offline: false
   Is Perennially Reserved: false
   Queue Full Sample Size: 0
   Queue Full Threshold: 0
   Thin Provisioning Status: unknown
   Attached Filters: 
   VAAI Status: unknown
   Other UIDs: vml.0100000000202020202057442d5743433445334e4131433058574443205744
   Is Shared Clusterwide: false
   Is Local SAS Device: false
   Is SAS: false
   Is USB: false
   Is Boot USB Device: false
   Is Boot Device: false
   Device Max Queue Depth: 31
   No of outstanding IOs with competing worlds: 32
   Drive Type: unknown
   RAID Level: unknown
   Number of Physical Drives: unknown
   Protection Enabled: false
   PI Activated: false
   PI Type: 0
   PI Protection Mask: NO PROTECTION
   Supported Guard Types: NO GUARD SUPPORT
   DIX Enabled: false
   DIX Guard Type: NO GUARD SUPPORT
   Emulated DIX/DIF Enabled: false
t10.ATA_____CT250BX100SSD1__________________________1448F0003E8B________
   Display Name: Local ATA Disk (t10.ATA_____CT250BX100SSD1__________________________1448F0003E8B________)
   Has Settable Display Name: true
   Size: 238475
   Device Type: Direct-Access 
   Multipath Plugin: NMP
   Devfs Path: /vmfs/devices/disks/t10.ATA_____CT250BX100SSD1__________________________1448F0003E8B________
   Vendor: ATA     
   Model: CT250BX100SSD1  
   Revision: MU01
   SCSI Level: 5
   Is Pseudo: false
   Status: on
   Is RDM Capable: false
   Is Local: true
   Is Removable: false
   Is SSD: true
   Is VVOL PE: false
   Is Offline: false
   Is Perennially Reserved: false
   Queue Full Sample Size: 0
   Queue Full Threshold: 0
   Thin Provisioning Status: yes
   Attached Filters: 
   VAAI Status: unknown
   Other UIDs: vml.01000000003134343846303030334538422020202020202020435432353042
   Is Shared Clusterwide: false
   Is Local SAS Device: false
   Is SAS: false
   Is USB: false
   Is Boot USB Device: false
   Is Boot Device: true
   Device Max Queue Depth: 31
   No of outstanding IOs with competing worlds: 32
   Drive Type: unknown
   RAID Level: unknown
   Number of Physical Drives: unknown
   Protection Enabled: false
   PI Activated: false
   PI Type: 0
   PI Protection Mask: NO PROTECTION
   Supported Guard Types: NO GUARD SUPPORT
   DIX Enabled: false
   DIX Guard Type: NO GUARD SUPPORT
   Emulated DIX/DIF Enabled: false
t10.ATA_____WDC_WD40EFRX2D68WT0N0_________________________WD2DWCC4E1SJA51R
   Display Name: Local ATA Disk (t10.ATA_____WDC_WD40EFRX2D68WT0N0_________________________WD2DWCC4E1SJA51R)
   Has Settable Display Name: true
   Size: 3815447
   Device Type: Direct-Access 
   Multipath Plugin: NMP
   Devfs Path: /vmfs/devices/disks/t10.ATA_____WDC_WD40EFRX2D68WT0N0_________________________WD2DWCC4E1SJA51R
   Vendor: ATA     
   Model: WDC WD40EFRX-68W
   Revision: 82.0
   SCSI Level: 5
   Is Pseudo: false
   Status: on
   Is RDM Capable: false
   Is Local: true
   Is Removable: false
   Is SSD: false
   Is VVOL PE: false
   Is Offline: false
   Is Perennially Reserved: false
   Queue Full Sample Size: 0
   Queue Full Threshold: 0
   Thin Provisioning Status: unknown
   Attached Filters: 
   VAAI Status: unknown
   Other UIDs: vml.0100000000202020202057442d574343344531534a41353152574443205744
   Is Shared Clusterwide: false
   Is Local SAS Device: false
   Is SAS: false
   Is USB: false
   Is Boot USB Device: false
   Is Boot Device: false
   Device Max Queue Depth: 31
   No of outstanding IOs with competing worlds: 32
   Drive Type: unknown
   RAID Level: unknown
   Number of Physical Drives: unknown
   Protection Enabled: false
   PI Activated: false
   PI Type: 0
   PI Protection Mask: NO PROTECTION
   Supported Guard Types: NO GUARD SUPPORT
   DIX Enabled: false
   DIX Guard Type: NO GUARD SUPPORT
   Emulated DIX/DIF Enabled: false
t10.ATA_____WDC_WD40EFRX2D68WT0N0_________________________WD2DWCC4E0CZLTA4
   Display Name: 
   Has Settable Display Name: false
   Size: 0
   Device Type: No device type 
   Multipath Plugin: 
   Devfs Path: 
   Vendor: 
   Model: 
   Revision: 
   SCSI Level: 0
   Is Pseudo: true
   Status: off
   Is RDM Capable: false
   Is Local: false
   Is Removable: false
   Is SSD: false
   Is VVOL PE: true
   Is Offline: true
   Is Perennially Reserved: false
   Queue Full Sample Size: 943080498
   Queue Full Threshold: 1481786949
   Thin Provisioning Status: no
   Attached Filters: 
   VAAI Status: unknown
   Other UIDs: 
   Is Shared Clusterwide: true
   Is Local SAS Device: false
   Is SAS: false
   Is USB: false
   Is Boot USB Device: false
   Is Boot Device: false
   Device Max Queue Depth: 0
   No of outstanding IOs with competing worlds: 0
   Drive Type: unknown
   RAID Level: unknown
   Number of Physical Drives: unknown
   Protection Enabled: false
   PI Activated: false
   PI Type: 1600085855
   PI Protection Mask: T1 T2 T3 T0+DIX T1+DIX T3+DIX
   Supported Guard Types: IP, CRC
   DIX Enabled: true
   DIX Guard Type: IP
   Emulated DIX/DIF Enabled: false
[root@esxi:/vmfs/volumes/55a7c30e-b2691c04-57ee-a01d48c70bec] 
[root@esxi:/vmfs/volumes/55a7c30e-b2691c04-57ee-a01d48c70bec] 
[root@esxi:/vmfs/volumes/55a7c30e-b2691c04-57ee-a01d48c70bec] esxcli storage core device stats get 
t10.ATA_____WDC_WD40EFRX2D68WT0N0_________________________WD2DWCC4E6RKT37L
   Device: t10.ATA_____WDC_WD40EFRX2D68WT0N0_________________________WD2DWCC4E6RKT37L
   Successful Commands: 580
   Blocks Read: 419
   Blocks Written: 0
   Read Operations: 143
   Write Operations: 0
   Reserve Operations: 0
   Reservation Conflicts: 0
   Failed Commands: 89454
   Failed Blocks Read: 0
   Failed Blocks Written: 0
   Failed Read Operations: 0
   Failed Write Operations: 0
   Failed Reserve Operations: 0
t10.ATA_____WDC_WD40EFRX2D68WT0N0_________________________WD2DWCC4E0AA8LS6
   Device: t10.ATA_____WDC_WD40EFRX2D68WT0N0_________________________WD2DWCC4E0AA8LS6
   Successful Commands: 527
   Blocks Read: 424
   Blocks Written: 0
   Read Operations: 102
   Write Operations: 0
   Reserve Operations: 0
   Reservation Conflicts: 0
   Failed Commands: 97736
   Failed Blocks Read: 0
   Failed Blocks Written: 0
   Failed Read Operations: 0
   Failed Write Operations: 0
   Failed Reserve Operations: 0
t10.ATA_____WDC_WD40EFRX2D68WT0N0_________________________WD2DWCC4E3NA1C0X
   Device: t10.ATA_____WDC_WD40EFRX2D68WT0N0_________________________WD2DWCC4E3NA1C0X
   Successful Commands: 578
   Blocks Read: 368
   Blocks Written: 0
   Read Operations: 138
   Write Operations: 0
   Reserve Operations: 0
   Reservation Conflicts: 0
   Failed Commands: 204270
   Failed Blocks Read: 0
   Failed Blocks Written: 0
   Failed Read Operations: 0
   Failed Write Operations: 0
   Failed Reserve Operations: 0
t10.ATA_____CT250BX100SSD1__________________________1448F0003E8B________
   Device: t10.ATA_____CT250BX100SSD1__________________________1448F0003E8B________
   Successful Commands: 93227
   Blocks Read: 1430776
   Blocks Written: 897961
   Read Operations: 56579
   Write Operations: 31911
   Reserve Operations: 1630
   Reservation Conflicts: 0
   Failed Commands: 1
   Failed Blocks Read: 0
   Failed Blocks Written: 0
   Failed Read Operations: 0
   Failed Write Operations: 0
   Failed Reserve Operations: 0
t10.ATA_____WDC_WD40EFRX2D68WT0N0_________________________WD2DWCC4E1SJA51R
   Device: t10.ATA_____WDC_WD40EFRX2D68WT0N0_________________________WD2DWCC4E1SJA51R
   Successful Commands: 532
   Blocks Read: 463
   Blocks Written: 0
   Read Operations: 141
   Write Operations: 0
   Reserve Operations: 0
   Reservation Conflicts: 0
   Failed Commands: 201956
   Failed Blocks Read: 0
   Failed Blocks Written: 0
   Failed Read Operations: 0
   Failed Write Operations: 0
   Failed Reserve Operations: 0
[root@esxi:/vmfs/volumes/55a7c30e-b2691c04-57ee-a01d48c70bec] esxcli storage core adapter stats get
vmhba0
   Successful Commands: 559
   Blocks Read: 463
   Blocks Written: 0
   Read Operations: 141
   Write Operations: 0
   Reserve Operations: 0
   Reservation Conflicts: 0
   Failed Commands: 202438
   Failed Blocks Read: 0
   Failed Blocks Written: 0
   Failed Read Operations: 0
   Failed Write Operations: 0
   Failed Reserve Operations: 0
   Total Splits: 0
   PAE Commands: 0
vmhba33
   Successful Commands: 623
   Blocks Read: 419
   Blocks Written: 0
   Read Operations: 143
   Write Operations: 0
   Reserve Operations: 0
   Reservation Conflicts: 0
   Failed Commands: 89964
   Failed Blocks Read: 0
   Failed Blocks Written: 0
   Failed Read Operations: 0
   Failed Write Operations: 0
   Failed Reserve Operations: 0
   Total Splits: 0
   PAE Commands: 0
vmhba34
   Successful Commands: 619
   Blocks Read: 368
   Blocks Written: 0
   Read Operations: 138
   Write Operations: 0
   Reserve Operations: 0
   Reservation Conflicts: 0
   Failed Commands: 204780
   Failed Blocks Read: 0
   Failed Blocks Written: 0
   Failed Read Operations: 0
   Failed Write Operations: 0
   Failed Reserve Operations: 0
   Total Splits: 0
   PAE Commands: 0
vmhba35
   Successful Commands: 568
   Blocks Read: 424
   Blocks Written: 0
   Read Operations: 102
   Write Operations: 0
   Reserve Operations: 0
   Reservation Conflicts: 0
   Failed Commands: 98246
   Failed Blocks Read: 0
   Failed Blocks Written: 0
   Failed Read Operations: 0
   Failed Write Operations: 0
   Failed Reserve Operations: 0
   Total Splits: 0
   PAE Commands: 0
vmhba36
   Successful Commands: 93413
   Blocks Read: 1430863
   Blocks Written: 898910
   Read Operations: 56614
   Write Operations: 32015
   Reserve Operations: 1633
   Reservation Conflicts: 0
   Failed Commands: 511
   Failed Blocks Read: 0
   Failed Blocks Written: 0
   Failed Read Operations: 0
   Failed Write Operations: 0
   Failed Reserve Operations: 0
   Total Splits: 0
   PAE Commands: 0
vmhba37
   Successful Commands: 0
   Blocks Read: 0
   Blocks Written: 0
   Read Operations: 0
   Write Operations: 0
   Reserve Operations: 0
   Reservation Conflicts: 0
   Failed Commands: 512
   Failed Blocks Read: 0
   Failed Blocks Written: 0
   Failed Read Operations: 0
   Failed Write Operations: 0
   Failed Reserve Operations: 0
   Total Splits: 0
   PAE Commands: 0
[root@esxi:/vmfs/volumes/55a7c30e-b2691c04-57ee-a01d48c70bec]