Please run "esxcfg-volume -l" from the command line and report the output.
where would I run this command?
You run the command from the ESXi console either through a PuTTY session or directly at the console. I would go the PuTTY route as it is easier to capture the output - here is a KB article on what to do to enable access: https://pubs.vmware.com/vsphere-6-5/index.jsp?topic=%2Fcom.vmware.vcli.getstart.doc%2FGUID-C3A44A30-EEA5-4359-A248-D13927A94CCE.html
Hope this helps.
Here is the output:
~ # esxcfg-volume -l
VMFS UUID/label: 50c4bee4-b6a8cb8e-192d-d4ae52c0525c/datastore1
Can mount: Yes
Can resignature: Yes
Extent name: naa.5000c50041d218bf:3 range: 0 - 471295 (MB)
As you have mentioned, it appears your mirror (RAID1) has broken with the two drives being seen as individual drives but exact copies of each other. As you have removed one of the drives, you should be able to mount the datastore with the following command:
esxcfg-volume -M 50c4bee4-b6a8cb8e-192d-d4ae52c0525c
The "-M" makes the mount persistent otherwise you will lose access again after a restart.
In regards to recreating the RAID set again this is something that would need to happen with the RAID controller however I suggest you gain access to your VMs first and then ensure you have a good backup/recovery position before continuing.
Thanks the VM guests returned to work again.
Thank you alot
I don't know how to thank you and the colleague responded above.
As you recommended, I will take backups. That is VM backups and drive image backups as well. Then I will sort out how to return RAID 1. Usually, I understood drives have to be formatted in order to enable RAID.