This is nothing to do with MSA I think. I just searched in Google and found many links where I see after reboot of ESX6.7 Datastore missing or got corrupted. Looks like some bug in ESX6.7
https://communities.vmware.com/thread/597817
https://communities.vmware.com/thread/597513
https://www.reddit.com/r/vmware/comments/9j8k6o/esxi_vmfs6_datastore_corruption_after_host_reboot/
Hope this helps!
Regards
Subhajit
I am an HPE employee
If you feel this was helpful please click the KUDOS! thumb below!
***********************************************************************************