Exsi virtual machine is missing vmdk file error [How to Solve]

background note: the virtual machine TANG2 lacks the vmdk file tang2.vmdk, resulting in boot failure and error

[ root@localhost :/vmfs/volumes/e9f402/tang2] ls -l

total 84028480
-rw-------    1 root     root     49936498688 Sep  9 02:30 tang2-000001-sesparse.vmdk
-rw-------    1 root     root           329 Aug 17  2020 tang2-000001.vmdk
-rw-------    1 root     root     4294967296 Dec 25  2019 tang2-Snapshot1.vmem
-rw-------    1 root     root       9732350 Dec 25  2019 tang2-Snapshot1.vmsn
-rw-------    1 root     root     107374182400 Dec 25  2019 tang2-flat.vmdk
-rw-------    1 root     root          8684 Sep  9 01:43 tang2.nvram
-rw-r--r--    1 root     root             0 Feb 24  2021 tang2.vmsd
-rwxr-xr-x    1 root     root          3303 Feb  7  2021 tang2.vmx
-rw-------    1 root     root          3237 Feb  7  2021 tang2.vmxf
-rw-------    1 root     root     107374182400 Sep  9 08:42 temp-flat.vmdk
-rw-------    1 root     root           494 Sep  9 08:42 temp.vmdk
-rw-r--r--    1 root     root        266758 Oct 18  2019 vmware-1.log
-rw-r--r--    1 root     root        351477 May  3  2020 vmware-2.log
-rw-r--r--    1 root     root        271780 Aug 17  2020 vmware-3.log
-rw-r--r--    1 root     root        296091 Sep  9 01:43 vmware-4.log
-rw-r--r--    1 root     root         78208 Sep  9 01:44 vmware-5.log
-rw-r--r--    1 root     root         76793 Sep  9 02:30 vmware.log

1. Generate a vmdk disk boot file based on the tang2-flat.vmdk file size 107374182400
[root@localhost:/vmfs/volumes/e9f402/tang2] vmkfstools -c 107374182400 -d thin temp.vmdk
Create: 100% done.
2. Delete the -flat.vmdk actual disk file and keep the .vmdk disk boot file**
[root@localhost:/vmfs/volumes/e9f402/tang2] rm -f temp-flat.vmdk
3. Rename the newly generated disk boot file to the missing file name

[root@localhost:/vmfs/volumes/e9f402/tang2] mv temp.vmdk tang2.vmdk
[root@localhost:/vmfs/volumes/e9f402/tang2] ls -l

total 84028480
-rw-------    1 root     root     49936498688 Sep  9 02:30 tang2-000001-sesparse.vmdk
-rw-------    1 root     root           329 Aug 17  2020 tang2-000001.vmdk
-rw-------    1 root     root     4294967296 Dec 25  2019 tang2-Snapshot1.vmem
-rw-------    1 root     root       9732350 Dec 25  2019 tang2-Snapshot1.vmsn
-rw-------    1 root     root     107374182400 Dec 25  2019 tang2-flat.vmdk
-rw-------    1 root     root          8684 Sep  9 01:43 tang2.nvram
-rw-------    1 root     root           494 Sep  9 08:42 tang2.vmdk
-rw-r--r--    1 root     root             0 Feb 24  2021 tang2.vmsd
-rwxr-xr-x    1 root     root          3303 Feb  7  2021 tang2.vmx
-rw-------    1 root     root          3237 Feb  7  2021 tang2.vmxf
-rw-r--r--    1 root     root        266758 Oct 18  2019 vmware-1.log
-rw-r--r--    1 root     root        351477 May  3  2020 vmware-2.log
-rw-r--r--    1 root     root        271780 Aug 17  2020 vmware-3.log
-rw-r--r--    1 root     root        296091 Sep  9 01:43 vmware-4.log
-rw-r--r--    1 root     root         78208 Sep  9 01:44 vmware-5.log
-rw-r--r--    1 root     root         76793 Sep  9 02:30 vmware.log

Confirm that the master disk is RW 209715200 VMFS “tang2-flat.vmdk”
[root@localhost:/vmfs/volumes/e9f402/tang2] vi tang2.vmdk

# Disk DescriptorFile
version=1
encoding="UTF-8"
CID=fffffffe
parentCID=ffffffff
isNativeSnapshot="no"
createType="vmfs"

 # Extent description
RW 209715200 VMFS "tang2-flat.vmdk"

 # The Disk Data Base
#DDB

ddb.adapterType = "lsilogic"
ddb.geometry.cylinders = "13054"
ddb.geometry.heads = "255"
ddb.geometry.sectors = "63"
ddb.longContentID = "dd1fc9f492c51eb078deb1b8fffffffe"
ddb.thinProvisioned = "1"
ddb.uuid = "60 00 C2 91 4b f7 a2 67-9d 42 aa b1 50 cf fe d0"
ddb.virtualHWVersion = "13"

[ root@localhost :/vmfs/volumes/e9f402/tang2]

4. Modify the secondary disk boot file as follows: parentcid = fffffffe modify the CID in the primary disk boot file
[ root@localhost :/vmfs/volumes/e9f402/tang2] vi tang2-000001.vmdk

# Disk DescriptorFile
version=1
encoding="UTF-8"
CID=daed5d66
parentCID=fffffffe
isNativeSnapshot="no"
createType="seSparse"
parentFileNameHint="tang2.vmdk"
 # Extent description
RW 209715200 SESPARSE "tang2-000001-sesparse.vmdk"

 # The Disk Data Base 
#DDB

ddb.grain = "8"
ddb.longContentID = "d6bf9759610883dad09509d5daed5d66" 
[root@localhost:/vmfs/volumes/e9f402/tang2] cat tang2-000001.vmdk 
 # Disk DescriptorFile
version=1
encoding="UTF-8"
CID=daed5d66
parentCID=fffffffe
isNativeSnapshot="no"
createType="seSparse"
parentFileNameHint="tang2.vmdk"
 # Extent description
RW 209715200 SESPARSE "tang2-000001-sesparse.vmdk"

 # The Disk Data Base 
#DDB

ddb.grain = "8"
ddb.longContentID = "d6bf9759610883dad09509d5daed5d66"

[ root@localhost :/vmfs/volumes/e9f402/tang2]

5. Check whether the disk chain configuration of the master vmdk file is correct
[ root@localhost :/vmfs/volumes/e9f402/tang2] vmkfstools -e tang2.vmdk
Disk chain is consistent.

6. Then check whether the disk chain configuration of the secondary vmdk file is correct
[ root@localhost :/vmfs/volumes/e9f402/tang2] vmkfstools -e tang2-000001.vmdk
Disk chain is consistent.

If the configuration is wrong, the following error messages will be reported:

It’s done. Turn on the console normally!

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